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A301326 Number of nX4 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1

%I #4 Mar 18 2018 08:38:09

%S 1,10,18,45,143,414,1481,5062,17879,62112,217402,764860,2687915,

%T 9462966,33320851,117384939,413427418,1456413781,5131048829,

%U 18077067261,63688856231,224392218311,790594491334,2785479832548,9814065517891

%N Number of nX4 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

%C Column 4 of A301330.

%H R. H. Hardin, <a href="/A301326/b301326.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

%e ..0..0..0..1. .0..1..0..1. .0..1..1..1. .0..0..0..0. .0..1..0..0

%e ..0..1..0..0. .1..1..1..1. .1..1..0..1. .0..1..0..0. .1..1..0..0

%e ..0..0..1..0. .0..0..0..0. .1..1..1..0. .1..1..1..1. .0..1..1..1

%e ..1..1..1..0. .0..1..0..0. .0..0..1..1. .0..0..1..1. .1..0..1..0

%e ..1..1..0..0. .0..0..0..1. .0..0..1..1. .0..1..1..0. .1..1..0..0

%Y Cf. A301330.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 18 2018

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Last modified April 24 12:41 EDT 2024. Contains 371938 sequences. (Running on oeis4.)