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 A219420 #5 Jul 23 2025 00:26:33 %S A219420 37,1292,46776,1709703,61543422,2222033208,80311501599,2901751767246, %T A219420 104841170968961,3788037696651135,136865946433226693, %U A219420 4945112174030871404,178672220976540890315,6455619364480811829503 %N A219420 Unchanging value maps: number of nX7 binary arrays indicating the locations of corresponding elements unequal to no horizontal or antidiagonal neighbor in a random 0..2 nX7 array. %C A219420 Column 7 of A219421 %e A219420 Some solutions for n=3 %e A219420 ..0..0..0..1..0..0..0....1..0..0..0..0..0..1....1..1..0..0..0..0..0 %e A219420 ..0..0..0..0..0..0..1....0..0..1..0..0..0..0....0..0..1..0..0..0..1 %e A219420 ..0..0..1..0..1..1..1....1..1..1..1..0..0..0....0..0..1..1..0..0..1 %K A219420 nonn %O A219420 1,1 %A A219420 _R. H. Hardin_ Nov 19 2012