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A198249
Number of 2nX8 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors
1
5, 485, 81440, 14520192, 2606019472, 468268681671, 84165911962889, 15129042589276259, 2719545932661264380, 488859618202335884730, 87876498667057316198136, 15796525069912515393284021
OFFSET
1,1
COMMENTS
Column 4 of A198253
LINKS
EXAMPLE
Some solutions for n=3
..0..0..1..1..2..2..3..3....0..0..1..1..2..2..1..1....0..0..1..1..2..2..3..3
..0..0..1..1..2..2..3..3....0..0..1..1..2..2..1..1....0..0..1..1..2..2..3..3
..3..3..2..2..3..3..2..2....1..1..0..0..3..3..2..2....1..1..3..3..4..4..2..2
..3..3..2..2..3..3..2..2....1..1..0..0..3..3..2..2....1..1..3..3..4..4..2..2
..1..1..3..3..2..2..4..4....3..3..2..2..4..4..3..3....3..3..1..1..0..0..4..4
..1..1..3..3..2..2..4..4....3..3..2..2..4..4..3..3....3..3..1..1..0..0..4..4
CROSSREFS
Sequence in context: A321939 A198978 A206502 * A160363 A268113 A308132
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 22 2011
STATUS
approved