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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.

A218425 Hilltop maps: number of nX7 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..1 nX7 array.

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%I A218425 #6 Jul 22 2025 23:57:06
%S A218425 57,11011,1207525,144597047,17270172871,2058493362799,245489633250861,
%T A218425 29274579482710357,3490981608801331021,416298960473587173025,
%U A218425 49643559085814354624329,5919983699927241114279393
%N A218425 Hilltop maps: number of nX7 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..1 nX7 array.
%C A218425 Column 7 of A218426
%H A218425 R. H. Hardin, <a href="/A218425/b218425.txt">Table of n, a(n) for n = 1..83</a>
%e A218425 Some solutions for n=3
%e A218425 ..0..1..0..1..0..1..1....0..1..1..1..1..0..0....0..1..0..1..0..1..1
%e A218425 ..0..0..0..1..1..1..0....0..1..1..1..1..1..0....0..1..0..0..1..1..1
%e A218425 ..0..1..1..1..1..0..1....0..0..0..1..1..0..1....0..0..1..0..1..0..0
%K A218425 nonn
%O A218425 1,1
%A A218425 _R. H. Hardin_ Oct 28 2012

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