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A278273
Number of n X n 0..1 arrays with every element both equal and not equal to some elements at offset (-1,-1) (-1,0) (-1,1) (0,-1) (0,1) or (1,0), with upper left element zero.
1
0, 2, 25, 1461, 350649, 329985827, 1158266740087, 15396080290130290, 772462850808202305809, 146439171275776627088638614, 104845555459822852114388229089230
OFFSET
1,2
COMMENTS
Diagonal of A278280.
LINKS
EXAMPLE
Some solutions for n=4
..0..1..1..0. .0..1..0..1. .0..1..1..0. .0..1..0..0. .0..1..0..1
..0..1..1..0. .0..1..0..1. .0..1..1..0. .0..1..0..1. .0..1..0..1
..1..1..1..0. .0..1..0..1. .0..1..1..0. .0..0..0..1. .1..0..0..0
..1..0..0..1. .0..1..1..1. .1..0..1..1. .0..1..1..0. .0..1..1..0
CROSSREFS
Cf. A278280.
Sequence in context: A015214 A204234 A203747 * A210836 A369675 A088816
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 16 2016
STATUS
approved