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A266923 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, southwest or southeast neighbor modulo 4 and the upper left element equal to 0. 1

%I

%S 2,23,376,7137,147378,3267167,75854154,1829256370,45273247748,

%T 1145456541787,29456215803420,768195833428293,20256437927385064,

%U 539323068676734715,14474594537260948272,391230710374639508192

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

%C Row 4 of A266921.

%H R. H. Hardin, <a href="/A266923/b266923.txt">Table of n, a(n) for n = 1..20</a>

%e Some solutions for n=5

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

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

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

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

%Y Cf. A266921.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 06 2016

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Last modified December 8 14:51 EST 2022. Contains 358695 sequences. (Running on oeis4.)