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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
OFFSET
1,4
COMMENTS
Column 1 of A265447.
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 09 2015
STATUS
approved