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!)
A264678 Number of (3+1)X(n+1) arrays of permutations of 0..n*4+3 with each element having directed index change -1,-1 1,0 -1,-2 -2,-2 or 0,1. 1
0, 9, 34, 123, 748, 3698, 17443, 84737, 414665, 2005125, 9713004, 47127519, 228570355, 1108064547, 5372882058, 26053821399, 126333862510, 612577288197, 2970352085648, 14403091243503, 69839730071000, 338648374694336 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Row 3 of A264676.
LINKS
FORMULA
Empirical: a(n) = 3*a(n-1) +7*a(n-2) +8*a(n-3) +63*a(n-4) -204*a(n-5) -330*a(n-6) -33*a(n-7) -753*a(n-8) +5131*a(n-9) +4454*a(n-10) -4248*a(n-11) +7015*a(n-12) -48191*a(n-13) -32905*a(n-14) +65323*a(n-15) -27694*a(n-16) +173763*a(n-17) +127266*a(n-18) -326578*a(n-19) +76681*a(n-20) -257552*a(n-21) -335862*a(n-22) +809888*a(n-23) -210179*a(n-24) +339020*a(n-25) +653025*a(n-26) -1539461*a(n-27) +207596*a(n-28) -364624*a(n-29) -1269055*a(n-30) +2691400*a(n-31) +488565*a(n-32) -214595*a(n-33) +1192214*a(n-34) -2335990*a(n-35) -1227030*a(n-36) +669413*a(n-37) -963255*a(n-38) +517564*a(n-39) +1507133*a(n-40) +62100*a(n-41) -84052*a(n-42) +492955*a(n-43) -482847*a(n-44) -398776*a(n-45) +148989*a(n-46) -138160*a(n-47) -38858*a(n-48) +119696*a(n-49) -8295*a(n-50) -25006*a(n-51) +22162*a(n-52) +4175*a(n-53) -10174*a(n-54) +6735*a(n-55) +1215*a(n-56) -3575*a(n-57) +1051*a(n-58) +12*a(n-59) -430*a(n-60) +67*a(n-61) +51*a(n-62) +27*a(n-63) -10*a(n-64) +8*a(n-65) +19*a(n-66) -8*a(n-67) -a(n-68) +3*a(n-69) -a(n-70)
EXAMPLE
Some solutions for n=4
..7.13..1..2..3....6..0..1..2..3....7..8..1..2..3....6..0..8..2..3
..0.12.19.14..4...11..5.14..7..4....0..5..6.14..4...17..1.19..7..4
..5..6.11..8..9...16.17.19..8..9...16.17.11.19..9....5.18.11.12..9
.10.15.16.17.18...10.15.12.13.18...10.15.12.13.18...10.15.16.13.14
CROSSREFS
Cf. A264676.
Sequence in context: A250652 A005344 A250763 * A050478 A204426 A154393
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 20 2015
STATUS
approved

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 April 23 10:21 EDT 2024. Contains 371905 sequences. (Running on oeis4.)