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A265467 Number of 2Xn 0..2+n-2 arrays with upper left zero and lower right 2+n-2 and each element differing from its horizontal and antidiagonal neighbors by one or two. 1
1, 3, 26, 139, 765, 6221, 46898, 292690, 1722770, 10915890, 73213113, 480069015, 3032127834, 19084607287, 122424984026, 792495253960, 5097255978957, 32562226190102, 208268070296589, 1338186393004984, 8611472163134863 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 2 of A265466.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=4

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

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

CROSSREFS

Cf. A265466.

Sequence in context: A055330 A034495 A034493 * A252872 A121626 A038697

Adjacent sequences:  A265464 A265465 A265466 * A265468 A265469 A265470

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 09 2015

STATUS

approved

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Last modified July 29 11:53 EDT 2021. Contains 346346 sequences. (Running on oeis4.)