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 A266834 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, west or northwest neighbor modulo 4 and the upper left element equal to 0. 1

%I

%S 2,11,95,1267,19605,322100,5798969,109094449,2137890119,42723425901,

%T 870452405353,17947494617157,374336019053969,7871123322669134,

%U 166752702383416172,3553681134317844777,76147251272709529075

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

%C Row 4 of A266832.

%H R. H. Hardin, <a href="/A266834/b266834.txt">Table of n, a(n) for n = 1..19</a>

%e Some solutions for n=5

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

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

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

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

%Y Cf. A266832.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 04 2016

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Last modified August 3 14:40 EDT 2021. Contains 346438 sequences. (Running on oeis4.)