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A265450 Number of n X n 0..2n-2 arrays with each element differing from its horizontal and vertical neighbors by one or two. 0
1, 18, 7422, 13943772, 122895678174, 5327856426356284, 1191337567990711362900, 1410907091881274891065515756 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A265458.

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Cf. A265458.

Sequence in context: A013723 A232595 A159405 * A213402 A248804 A060617

Adjacent sequences:  A265447 A265448 A265449 * A265451 A265452 A265453

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 09 2015

STATUS

approved

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Last modified April 24 12:21 EDT 2019. Contains 322429 sequences. (Running on oeis4.)