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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.

A218353 Hilltop maps: number of nX7 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..1 nX7 array.

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%I A218353 #6 Jul 22 2025 23:55:30
%S A218353 57,7361,757305,78394141,8199377227,856149291505,89373230342147,
%T A218353 9330728065217697,974144457139164177,101701766819321353361,
%U A218353 10617786795585969799967,1108509971334366966147185
%N A218353 Hilltop maps: number of nX7 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..1 nX7 array.
%C A218353 Column 7 of A218354
%H A218353 R. H. Hardin, <a href="/A218353/b218353.txt">Table of n, a(n) for n = 1..34</a>
%e A218353 Some solutions for n=3
%e A218353 ..0..1..1..0..0..1..0....0..1..0..1..0..0..1....0..1..1..1..1..1..0
%e A218353 ..0..0..0..1..1..0..1....0..0..0..1..1..0..1....0..1..1..1..0..0..1
%e A218353 ..1..1..0..0..0..1..1....1..1..1..1..0..1..1....0..1..0..1..0..1..0
%K A218353 nonn
%O A218353 1,1
%A A218353 _R. H. Hardin_ Oct 26 2012

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