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 A301945 Number of n X n 0..1 arrays with every element equal to 1, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero. 1

%I

%S 0,2,20,947,120815,58609226,86143630040,418568449327270,

%T 6527100767589040926,331808147283786972146018,

%U 54543586667142977292165721500,29084806316831133817614992597097070

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

%C Diagonal of A301951.

%H R. H. Hardin, <a href="/A301945/b301945.txt">Table of n, a(n) for n = 1..13</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A301951.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 29 2018

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Last modified January 22 07:31 EST 2022. Contains 350481 sequences. (Running on oeis4.)