cp's OEIS Frontend

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.

A303089 Number of 7Xn 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

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%I A303089 #4 Apr 18 2018 12:24:53
%S A303089 64,21,5472,4182,615471,4862916,266882021,5924274499,231312682374,
%T A303089 7326136324116,265724475520255,9228359438652216,330920558831885611,
%U A303089 11758758712910364555,421228402696480451106,15057312628686341086187
%N A303089 Number of 7Xn 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
%C A303089 Row 7 of A303084.
%H A303089 R. H. Hardin, <a href="/A303089/b303089.txt">Table of n, a(n) for n = 1..210</a>
%e A303089 Some solutions for n=5
%e A303089 ..0..0..0..0..1. .0..0..0..0..0. .0..0..0..1..1. .0..0..0..0..1
%e A303089 ..0..0..1..0..0. .1..0..0..0..0. .0..0..1..1..1. .0..0..0..0..1
%e A303089 ..0..0..1..0..0. .1..0..1..0..1. .1..0..0..1..0. .1..0..1..0..0
%e A303089 ..1..1..0..1..1. .0..0..0..0..0. .0..0..0..1..1. .0..0..0..0..0
%e A303089 ..1..1..0..1..1. .0..0..0..0..0. .0..1..1..1..0. .1..1..0..1..1
%e A303089 ..1..1..1..1..1. .1..1..1..1..1. .0..0..1..1..1. .0..1..1..1..0
%e A303089 ..1..1..0..1..0. .0..1..1..1..1. .0..0..0..1..1. .0..1..1..1..0
%Y A303089 Cf. A303084.
%K A303089 nonn
%O A303089 1,1
%A A303089 _R. H. Hardin_, Apr 18 2018