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A266293 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, west or northeast neighbor modulo 4 and the upper left element equal to 0. 1

%I

%S 2,9,91,1233,18827,323444,5826961,110866391,2163054304,43343013317,

%T 881391937160,18187248704334,378905566162207,7966181836169943,

%U 168631785538687281,3592456489311716500,76933383114445494985

%N Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, west or northeast neighbor modulo 4 and the upper left element equal to 0.

%C Row 4 of A266291.

%H R. H. Hardin, <a href="/A266293/b266293.txt">Table of n, a(n) for n = 1..24</a>

%e Some solutions for n=5

%e ..0..0..3..1..3....0..3..2..2..1....0..0..3..3..1....0..2..0..3..3

%e ..2..2..1..1..1....2..2..2..1..1....2..2..2..1..1....0..2..2..1..3

%e ..0..0..3..3..3....1..0..0..3..3....1..0..0..0..3....2..1..0..3..1

%e ..0..2..2..2..1....0..0..3..3..1....3..3..2..2..1....1..0..2..1..3

%Y Cf. A266291.

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 26 2015

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Last modified September 22 06:08 EDT 2020. Contains 337289 sequences. (Running on oeis4.)