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 A207425 #7 Jul 22 2025 20:25:02 %S A207425 40,1600,20550,241087,3210938,39698733,474552171,5755114104, %T A207425 69609375870,836438494500,10061632597765,121113950382680, %U A207425 1456404024212421,17511407393280395,210603058946646014,2532582001420108242 %N A207425 Number of nX7 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically. %C A207425 Column 7 of A207426 %H A207425 R. H. Hardin, <a href="/A207425/b207425.txt">Table of n, a(n) for n = 1..210</a> %e A207425 Some solutions for n=4 %e A207425 ..1..1..0..1..1..0..0....0..1..1..1..1..0..1....1..1..0..1..1..0..1 %e A207425 ..0..1..1..0..0..1..1....1..1..1..1..1..1..1....1..0..1..1..1..0..1 %e A207425 ..0..0..1..1..1..1..1....1..1..1..1..1..1..1....0..0..1..1..0..0..1 %e A207425 ..0..1..1..1..1..0..1....1..1..1..1..1..1..0....0..0..1..1..1..0..1 %K A207425 nonn %O A207425 1,1 %A A207425 _R. H. Hardin_ Feb 17 2012