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 A208708 #7 Jul 22 2025 21:29:05 %S A208708 64,4516,334948,24754628,1830045552,135288700496,10001404535216, %T A208708 739367693888784,54658781788350480,4040726220144359312, %U A208708 298716287704524626960,22083015695332916533648,1632517550173528777448208 %N A208708 Number of nX7 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors. %C A208708 Column 7 of A208709 %H A208708 R. H. Hardin, <a href="/A208708/b208708.txt">Table of n, a(n) for n = 1..210</a> %F A208708 Empirical: a(n) = 83*a(n-1) -710*a(n-2) +3004*a(n-3) -7952*a(n-4) +16752*a(n-5) -27360*a(n-6) +33984*a(n-7) -26368*a(n-8) for n>10 %e A208708 Some solutions for n=4 %e A208708 ..0..0..0..1..0..1..0....0..0..1..0..1..1..1....0..0..0..0..0..1..1 %e A208708 ..0..1..1..0..1..1..0....0..0..1..1..0..1..1....0..1..0..1..1..0..1 %e A208708 ..1..0..0..0..1..0..0....0..1..0..0..1..0..0....1..1..1..0..0..1..0 %e A208708 ..1..1..0..1..0..1..0....0..0..1..0..0..1..1....0..1..0..1..1..1..1 %K A208708 nonn %O A208708 1,1 %A A208708 _R. H. Hardin_ Mar 01 2012