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A265443 Number of nX4 0..n+4-2 arrays with upper left zero and lower right n+4-2 and each element differing from its horizontal and vertical neighbors by one or two. 1

%I #4 Dec 09 2015 09:01:28

%S 2,53,2825,57721,744805,19827238,901139380,27582975041,585047767454,

%T 12075039660966,359970464643303,12067493373744711,338956805544196323,

%U 8183389364550726340,205413155196816637232,5971274995018639609623

%N Number of nX4 0..n+4-2 arrays with upper left zero and lower right n+4-2 and each element differing from its horizontal and vertical neighbors by one or two.

%C Column 4 of A265447.

%H R. H. Hardin, <a href="/A265443/b265443.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

%e ..0..1..3..4....0..2..4..5....0..2..3..4....0..1..3..5....0..2..3..4

%e ..2..3..5..3....2..4..5..3....2..4..2..3....1..3..4..3....2..3..4..3

%e ..4..5..6..4....3..5..4..5....3..2..4..5....2..4..6..5....3..1..3..5

%e ..5..6..5..6....5..4..5..6....5..3..5..6....4..6..5..6....4..3..4..6

%Y Cf. A265447.

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 09 2015

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Last modified March 29 08:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)