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 A266601 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north or northeast neighbor modulo 4 and the upper left element equal to 0. 1

%I #6 Aug 12 2016 06:53:59

%S 2,38,964,30637,1073367,39966856,1551883779,62152155338,2549025811419,

%T 106526379738263,4520170915107051,194230279053023377,

%U 8434658244488956260,369593817153717655945,16321035858001412664324,725605378261164051062577

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

%C Row 4 of A266599.

%H R. H. Hardin, <a href="/A266601/b266601.txt">Table of n, a(n) for n = 1..26</a>

%e Some solutions for n=4

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

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

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

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

%Y Cf. A266599.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 01 2016

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Last modified October 3 13:46 EDT 2023. Contains 365866 sequences. (Running on oeis4.)