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A266311 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its west neighbor modulo 4 and the upper left element equal to 0. 1

%I

%S 6,171,8190,442285,25839438,1605405629,103948820622,6930557596953,

%T 472599444039774,32808183003171211,2310785736121024350,

%U 164716310371150628603,11860112155495496736974,861339905567424795731145

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

%C Row 4 of A266309.

%H R. H. Hardin, <a href="/A266311/b266311.txt">Table of n, a(n) for n = 1..20</a>

%e Some solutions for n=3

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

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

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

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

%Y Cf. A266309.

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 26 2015

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Last modified August 19 06:48 EDT 2022. Contains 356216 sequences. (Running on oeis4.)