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 A221445 #6 Jul 23 2025 01:56:16 %S A221445 57,5785,543081,51186449,4832005625,456064257841,43045366565233, %T A221445 4062814670687601,383466625153100089,36193296042509422929, %U A221445 3416085237442369485553,322425410952503720400913 %N A221445 Hilltop maps: number of nX7 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..1 nX7 array. %C A221445 Column 7 of A221446 %H A221445 R. H. Hardin, <a href="/A221445/b221445.txt">Table of n, a(n) for n = 1..50</a> %e A221445 Some solutions for n=3 %e A221445 ..0..1..1..1..1..0..1....0..1..1..1..1..0..1....0..1..1..1..1..1..1 %e A221445 ..0..1..1..1..0..0..1....0..0..1..1..1..1..0....0..0..1..0..0..0..1 %e A221445 ..0..1..0..1..1..1..1....0..1..1..0..0..1..1....0..1..0..0..1..1..1 %K A221445 nonn %O A221445 1,1 %A A221445 _R. H. Hardin_ Jan 17 2013