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, 3, 26, 139, 765, 6221, 46898, 292690, 1722770, 10915890, 73213113, 480069015, 3032127834, 19084607287, 122424984026, 792495253960, 5097255978957, 32562226190102, 208268070296589, 1338186393004984, 8611472163134863

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