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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.

A205309 Number of n X 7 0..3 arrays with no occurrence of three equal elements in a row horizontally or vertically, and new values 0..3 introduced in row major order.

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%I A205309 #6 Jun 06 2018 15:40:31
%S A205309 528,6427791,50933680120,442834241887042,3775750320744043966,
%T A205309 32325164995795813807941
%N A205309 Number of n X 7 0..3 arrays with no occurrence of three equal elements in a row horizontally or vertically, and new values 0..3 introduced in row major order.
%e A205309 Some solutions for n=5
%e A205309 ..0..0..1..0..0..1..1....0..1..2..2..1..0..0....0..1..1..0..0..2..3
%e A205309 ..2..1..0..1..3..1..3....3..0..0..1..1..2..3....3..0..0..2..1..3..2
%e A205309 ..3..1..1..3..0..2..0....3..3..2..0..0..2..1....0..1..0..2..0..1..2
%e A205309 ..0..2..0..0..1..1..3....1..3..1..0..0..1..0....1..3..1..0..1..3..3
%e A205309 ..3..0..3..1..1..3..2....2..0..2..1..1..0..3....2..0..2..2..1..1..0
%Y A205309 Column 7 of A205310.
%K A205309 nonn
%O A205309 1,1
%A A205309 _R. H. Hardin_, Jan 25 2012

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