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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 22 2011
STATUS
approved

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Last modified March 28 12:59 EDT 2024. Contains 371254 sequences. (Running on oeis4.)