|
%I #4 Mar 31 2012 12:36:34
%S 15,6528,4059950,2606019472,1683040515731,1088857594220452,
%T 704825868750085006
%N Number of 2nX10 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors
%C Column 5 of A198253
%e Some solutions for n=3
%e ..0..0..0..0..0..0..0..0..1..1....0..0..0..0..0..0..1..1..2..2
%e ..0..2..2..3..3..4..4..0..1..1....0..1..1..3..3..0..1..1..2..2
%e ..0..2..2..3..3..4..4..0..3..3....0..1..1..3..3..0..3..3..0..0
%e ..0..0..0..0..0..0..0..0..3..3....0..0..0..0..0..0..3..3..0..0
%e ..1..1..2..2..1..1..3..3..2..2....3..3..4..4..1..1..2..2..1..1
%e ..1..1..2..2..1..1..3..3..2..2....3..3..4..4..1..1..2..2..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Oct 22 2011
| 