The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A203938 Number of (n+1)X3 0..5 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) nondecreasing in column and row directions, respectively 1

%I #5 Mar 31 2012 12:37:00

%S 4471,91396,1350442,15288484,145455811,1186308022,8607173216,

%T 56414423998,340158722704,1907547529456,10054111267835,50188065610406,

%U 238892619282934,1090189574059542,4792342014793388,20372738874767190

%N Number of (n+1)X3 0..5 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) nondecreasing in column and row directions, respectively

%C Column 2 of A203944

%H R. H. Hardin, <a href="/A203938/b203938.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 41*a(n-1) -756*a(n-2) +8092*a(n-3) -52994*a(n-4) +187938*a(n-5) -4896*a(n-6) -3516348*a(n-7) +16307630*a(n-8) -16255022*a(n-9) -144874730*a(n-10) +643954340*a(n-11) -413594286*a(n-12) -4725980688*a(n-13) +14701463915*a(n-14) +3206495241*a(n-15) -107845952727*a(n-16) +181392027153*a(n-17) +318997719378*a(n-18) -1504214506712*a(n-19) +649644395320*a(n-20) +6192363987604*a(n-21) -11041884592111*a(n-22) -11890100719013*a(n-23) +56590394403028*a(n-24) -18867865715200*a(n-25) -173771210864807*a(n-26) +230277285039455*a(n-27) +313919995022182*a(n-28) -931823570221688*a(n-29) -76836755864653*a(n-30) +2435097165126919*a(n-31) -1622955595485466*a(n-32) -4410192209123244*a(n-33) +6456444761648337*a(n-34) +4918443565399489*a(n-35) -15496959555301252*a(n-36) -135682027406268*a(n-37) +27120842590118366*a(n-38) -13905977541311120*a(n-39) -35750398447563310*a(n-40) +37670182875491098*a(n-41) +33740169243679502*a(n-42) -65261268209963804*a(n-43) -16470665337966139*a(n-44) +85846959284662959*a(n-45) -12957902945880108*a(n-46) -89729638897851620*a(n-47) +44001785808789219*a(n-48) +74782058471680699*a(n-49) -64639011844488028*a(n-50) -47883893613059550*a(n-51) +68524253055606866*a(n-52) +20210726426572810*a(n-53) -57784407645802933*a(n-54) -484615133009475*a(n-55) +40041365168701250*a(n-56) -8694893553569570*a(n-57) -23006955574010142*a(n-58) +9854574619742212*a(n-59) +10888438912464061*a(n-60) -7252321976505707*a(n-61) -4128422661734826*a(n-62) +4135002596993622*a(n-63) +1156681702309747*a(n-64) -1922496424850251*a(n-65) -167019988903534*a(n-66) +742465422456294*a(n-67) -44901526708563*a(n-68) -239221100605037*a(n-69) +44679941474363*a(n-70) +63979480384033*a(n-71) -19746407685096*a(n-72) -13990928766934*a(n-73) +6215462339353*a(n-74) +2423314770365*a(n-75) -1519275568746*a(n-76) -308916695820*a(n-77) +295237531508*a(n-78) +22460125850*a(n-79) -45616219880*a(n-80) +929333814*a(n-81) +5520093831*a(n-82) -555675777*a(n-83) -506857657*a(n-84) +88974409*a(n-85) +33252495*a(n-86) -8622601*a(n-87) -1363978*a(n-88) +536568*a(n-89) +20508*a(n-90) -19892*a(n-91) +792*a(n-92) +336*a(n-93) -32*a(n-94) for n>98

%e Some solutions for n=4

%e ..5..5..5....3..0..4....4..5..5....5..3..3....1..2..1....1..4..1....1..5..4

%e ..5..5..5....0..5..3....5..5..5....3..5..5....3..2..5....5..2..5....4..4..5

%e ..5..5..5....4..3..5....5..5..5....3..5..5....3..4..5....2..5..4....4..4..5

%e ..5..5..5....2..5..3....5..5..5....4..5..5....4..4..5....5..4..5....3..5..4

%e ..5..5..5....4..3..5....5..5..5....5..5..5....3..5..4....4..5..4....4..4..5

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 08 2012

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 12 19:25 EDT 2024. Contains 372494 sequences. (Running on oeis4.)