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!)
A251978 Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum not 0 1 2 7 8 or 9 and every diagonal and antidiagonal sum 0 1 2 7 8 or 9 1
41682, 516108, 4379034, 26230040, 196459816, 1645790820, 13277304274, 103969785600, 818715734694, 6500654740228, 51596730375356, 408712971161574, 3237078260833534, 25650449408415052, 203271994945959992 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A251983
LINKS
FORMULA
Empirical: a(n) = 13*a(n-1) -58*a(n-2) +183*a(n-3) -282*a(n-4) -748*a(n-5) +3248*a(n-6) -5332*a(n-7) +10416*a(n-8) -35623*a(n-9) -13556*a(n-10) +93393*a(n-11) +162756*a(n-12) -7293*a(n-13) -110282*a(n-14) -1253650*a(n-15) +981271*a(n-16) -129815*a(n-17) +3449349*a(n-18) -5138523*a(n-19) +2737961*a(n-20) -12024983*a(n-21) +18181720*a(n-22) -16569588*a(n-23) +35870132*a(n-24) -41547276*a(n-25) +35883987*a(n-26) -40690935*a(n-27) +33997016*a(n-28) -23611171*a(n-29) +15754277*a(n-30) -13463427*a(n-31) +14686344*a(n-32) -24430037*a(n-33) +35528759*a(n-34) -41290795*a(n-35) +50974775*a(n-36) -52828648*a(n-37) +46639137*a(n-38) -39396042*a(n-39) +29490546*a(n-40) -19546499*a(n-41) +11451226*a(n-42) -4715413*a(n-43) +784934*a(n-44) +405439*a(n-45) -494432*a(n-46) +384535*a(n-47) -217676*a(n-48) +26201*a(n-49) +42601*a(n-50) -23414*a(n-51) +8724*a(n-52) -4380*a(n-53) +976*a(n-54) -68*a(n-55) +28*a(n-56) for n>60
EXAMPLE
Some solutions for n=1
..2..1..2..0..2....2..1..2..0..3....1..0..3..0..1....3..1..2..2..1
..1..3..0..3..0....1..3..0..3..0....1..3..0..3..2....0..3..0..3..2
..2..2..2..1..2....2..0..3..0..3....3..0..3..2..1....3..0..3..0..3
CROSSREFS
Sequence in context: A028239 A248445 A339796 * A258689 A258685 A031849
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 12 2014
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 June 16 10:55 EDT 2024. Contains 373425 sequences. (Running on oeis4.)