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 A189058 #9 Jul 22 2025 11:31:46 %S A189058 2,16,316,13452,1492864,477128662,394122762759,784513337393283, %T A189058 3926743880389817150,51771451826541027208329, %U A189058 1779743524151020048520647828,155456866004795629005264664261677 %N A189058 Number of n X n binary arrays without the pattern 0 1 0 antidiagonally or horizontally. %C A189058 Diagonal of A189064 %H A189058 R. H. Hardin, <a href="/A189058/b189058.txt">Table of n, a(n) for n = 1..18</a> %e A189058 Some solutions for 3X3 %e A189058 ..1..1..1....0..0..0....1..1..1....1..0..1....1..0..1....1..0..1....0..1..1 %e A189058 ..1..0..0....0..0..1....1..1..0....0..0..1....1..1..0....0..1..1....1..0..1 %e A189058 ..0..1..1....1..1..1....1..1..0....1..1..0....1..1..0....1..0..1....1..0..1 %K A189058 nonn %O A189058 1,1 %A A189058 _R. H. Hardin_ Apr 16 2011