A265440 Number of nX1 0..n+1-2 arrays with upper left zero and lower right n+1-2 and each element differing from its horizontal and vertical neighbors by one or two.

1, 1, 1, 2, 9, 29, 79, 220, 673, 2106, 6480, 19803, 61085, 190155, 593635, 1854310, 5802490, 18203576, 57227627, 180170568, 567940927, 1792532647, 5664324570, 17917857888, 56732156348, 179781808709, 570178314799, 1809666098574

Offset

1,4

Comments

Column 1 of A265447.

Links

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

Example

All solutions for n=4
..0....0
..1....2
..2....1
..3....3

Crossrefs

Cf. A265447.

Sequence in context: A123058 A212272 A062452 * A152891 A181545 A069006

Adjacent sequences: A265437 A265438 A265439 * A265441 A265442 A265443

Keyword

nonn

Author

R. H. Hardin, Dec 09 2015

Status

approved