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 A222388 #6 Jul 23 2025 02:33:50 %S A222388 8,64,512,3968,32768,262144,2093824,16776064,134121152,1073741824, %T A222388 8589934592,68719450112,549755703296,4398040219648,35184371580928, %U A222388 281474867658752,2251799813685248,18014398509481984,144115184855048192 %N A222388 Sum of neighbor maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to the sum mod 3 of their horizontal and antidiagonal neighbors in a random 0..2 3Xn array. %C A222388 Row 3 of A222386 %H A222388 R. H. Hardin, <a href="/A222388/b222388.txt">Table of n, a(n) for n = 1..210</a> %e A222388 Some solutions for n=3 %e A222388 ..0..0..1....0..0..0....1..0..0....1..1..1....0..0..0....1..0..1....1..0..0 %e A222388 ..1..1..0....1..1..1....1..1..1....0..0..0....1..0..0....0..1..0....1..1..1 %e A222388 ..1..1..1....1..0..1....1..1..0....0..1..0....1..0..0....1..0..0....0..1..1 %K A222388 nonn %O A222388 1,1 %A A222388 _R. H. Hardin_ Feb 18 2013