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A278170
Number of n X n 0..1 arrays with every element both equal and not equal to some elements at offset (-1,0) (-1,1) (0,-1) (0,1) (1,-1) or (1,0), with upper left element zero.
1
0, 2, 18, 1476, 396024, 408355632, 1580935773900, 23184238421031934, 1286347795694708130944, 270105371559062140434880346, 214634588261090465589376419637454
OFFSET
1,2
COMMENTS
Diagonal of A278177.
LINKS
EXAMPLE
Some solutions for n=4
..0..1..0..0. .0..1..1..0. .0..0..0..1. .0..1..1..0. .0..0..1..0
..0..1..1..1. .0..0..0..1. .1..0..0..1. .0..0..1..0. .1..1..0..0
..0..1..0..1. .1..0..1..0. .1..0..1..0. .0..1..1..1. .1..0..1..1
..1..1..0..0. .1..1..1..0. .0..0..1..0. .0..0..0..0. .1..0..0..1
CROSSREFS
Cf. A278177.
Sequence in context: A069651 A289949 A123558 * A155206 A334623 A260610
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 13 2016
STATUS
approved