cp's OEIS Frontend

A266573 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its northwest or southwest neighbor modulo 3 and the upper left element equal to 0.

%I A266573 #6 Aug 12 2016 06:53:59
%S A266573 2,5,15,109,574,2840,13767,71646,390862,2170370,11989812,66094738,
%T A266573 366119221,2044786962,11503587136,65003352026,368281990242,
%U A266573 2091514533360,11909843102866,68009104297282,389348569168108,2233795881384252
%N A266573 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its northwest or southwest neighbor modulo 3 and the upper left element equal to 0.
%C A266573 Row 3 of A266572.
%H A266573 R. H. Hardin, <a href="/A266573/b266573.txt">Table of n, a(n) for n = 1..73</a>
%e A266573 Some solutions for n=6
%e A266573 ..0..1..1..0..0..1....0..2..0..1..1..0....0..2..2..0..1..2....0..1..0..0..1..1
%e A266573 ..2..2..0..1..2..0....2..0..1..2..0..1....2..0..1..2..0..1....2..0..0..2..2..0
%e A266573 ..2..1..2..0..1..2....0..1..2..1..2..2....1..1..0..1..2..0....1..1..2..2..1..2
%Y A266573 Cf. A266572.
%K A266573 nonn
%O A266573 1,1
%A A266573 _R. H. Hardin_, Jan 01 2016