This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A181211 #5 Jul 22 2025 08:35:43 %S A181211 128,1156,38936,652864,15786848,315701824,6985036032,146719641600, %T A181211 3168621039616,67463750631424,1447364588320768,30930859081810944, %U A181211 662387735874816000,14169961476541661184,303300655391773020160 %N A181211 Number of nX7 binary matrices with no two 1's adjacent diagonally or antidiagonally. %C A181211 Column 7 of A181212 %H A181211 R. H. Hardin, <a href="/A181211/b181211.txt">Table of n, a(n) for n=1..100</a> %F A181211 Empirical: a(n)=30*a(n-1)-5664*a(n-3)+28924*a(n-4)+269000*a(n-5)-2020704*a(n-6)-3766112*a(n-7)+50266144*a(n-8)-14668480*a(n-9)-554895616*a(n-10)+703166720*a(n-11)+2841716480*a(n-12)-5523241472*a(n-13)-6148366336*a(n-14)+18197354496*a(n-15)+2156556288*a(n-16)-26980270080*a(n-17)+8757542912*a(n-18)+17095786496*a(n-19)-9858056192*a(n-20)-3497000960*a(n-21)+3006267392*a(n-22)-260046848*a(n-24)+33554432*a(n-25) %K A181211 nonn %O A181211 1,1 %A A181211 _R. H. Hardin_ Oct 10 2010