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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A198253

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..51

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

Adjacent sequences: A198246 A198247 A198248 * A198250 A198251 A198252

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 22 2011

STATUS

approved

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Last modified December 6 13:15 EST 2022. Contains 358634 sequences. (Running on oeis4.)