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 A218352 #6 Jul 22 2025 23:55:23 %S A218352 31,2007,105913,5609569,300126903,16031828359,856149291505, %T A218352 45726317510017,2442206384575879,130435504723928475, %U A218352 6966420606934069925,372069142324752766777,19871816932607721069123,1061332595121563636599299 %N A218352 Hilltop maps: number of nX6 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..1 nX6 array. %C A218352 Column 6 of A218354 %H A218352 R. H. Hardin, <a href="/A218352/b218352.txt">Table of n, a(n) for n = 1..72</a> %e A218352 Some solutions for n=3 %e A218352 ..1..1..0..1..1..1....0..1..1..1..0..1....1..1..1..1..1..0....0..0..1..1..0..1 %e A218352 ..0..0..1..0..1..0....1..1..0..0..0..1....0..1..0..1..1..0....1..0..1..0..1..1 %e A218352 ..1..0..0..1..1..0....0..0..0..1..0..0....0..1..1..1..1..1....1..0..1..0..0..1 %K A218352 nonn %O A218352 1,1 %A A218352 _R. H. Hardin_ Oct 26 2012