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A198246 Number of 2nX2n 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors 0
1, 5, 1675, 14520192, 1683040515731 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A198253

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=3

..0..0..1..1..2..2....0..0..1..1..2..2....0..0..1..1..2..2....0..0..1..1..0..0

..0..0..1..1..2..2....0..0..1..1..2..2....0..0..1..1..2..2....0..0..1..1..0..0

..1..1..2..2..3..3....1..1..2..2..3..3....3..3..2..2..4..4....1..1..0..0..2..2

..1..1..2..2..3..3....1..1..2..2..3..3....3..3..2..2..4..4....1..1..0..0..2..2

..4..4..0..0..4..4....2..2..0..0..4..4....4..4..0..0..3..3....2..2..3..3..1..1

..4..4..0..0..4..4....2..2..0..0..4..4....4..4..0..0..3..3....2..2..3..3..1..1

CROSSREFS

Sequence in context: A262628 A237914 A057199 * A122465 A203683 A330057

Adjacent sequences:  A198243 A198244 A198245 * A198247 A198248 A198249

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 22 2011

STATUS

approved

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Last modified September 25 05:04 EDT 2022. Contains 356953 sequences. (Running on oeis4.)