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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. 2
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified February 26 00:08 EST 2020. Contains 332270 sequences. (Running on oeis4.)