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.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A234651 Number of (n+1) X (1+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant-stress 1 X 1 tilings). 1
 160, 728, 3264, 15008, 67840, 315008, 1434624, 6722048, 30822400, 145614848, 671760384, 3197247488, 14829813760, 71052197888, 331140562944, 1595912880128, 7469054033920, 36183831216128, 169965785186304, 827149902675968 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 4*a(n-1) + 44*a(n-2) - 176*a(n-3) - 480*a(n-4) + 1920*a(n-5). Empirical g.f.: 8*x*(20 + 11*x - 836*x^2 - 240*x^3 + 8640*x^4) / ((1 - 4*x)*(1 - 20*x^2)*(1 - 24*x^2)). - Colin Barker, Oct 15 2018 EXAMPLE Some solutions for n=5: 5 2 4 4 2 4 5 1 0 1 1 2 2 3 5 4 2 2 1 4 4 5 4 0 3 1 1 1 5 2 4 1 4 1 0 3 1 5 2 1 5 2 5 5 2 4 4 0 1 2 1 2 2 3 1 0 2 2 1 4 0 1 0 4 4 2 1 1 5 2 3 0 4 1 2 5 0 4 5 4 5 2 1 1 0 2 4 0 0 1 3 4 1 2 5 4 5 5 0 3 1 2 1 5 2 0 4 4 0 5 0 5 3 0 5 0 0 4 4 3 CROSSREFS Column 1 of A234658. Sequence in context: A233917 A233910 A234658 * A234898 A234891 A305272 Adjacent sequences: A234648 A234649 A234650 * A234652 A234653 A234654 KEYWORD nonn AUTHOR R. H. Hardin, Dec 29 2013 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.

Last modified May 19 07:05 EDT 2024. Contains 372666 sequences. (Running on oeis4.)