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A318061
Number of nXn 0..1 arrays with every element unequal to 1, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0
0, 5, 98, 7170, 1405892, 824452611, 1415459855958, 7157366531123400, 106446951098115244867, 4657843289298337507871141, 599615985241029931750858863964
OFFSET
1,2
COMMENTS
Diagonal of A318068.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..1. .0..0..0..0..1. .0..0..0..0..0
..1..0..1..1..0. .1..1..1..0..0. .1..1..1..1..0. .1..1..1..0..1
..0..1..1..0..0. .0..1..0..1..1. .0..1..1..1..0. .1..1..1..1..1
..1..1..0..0..1. .1..0..1..0..0. .0..0..0..0..1. .0..1..0..1..0
..0..1..1..0..1. .0..1..0..1..1. .1..0..1..0..0. .0..0..0..1..1
CROSSREFS
Cf. A318068.
Sequence in context: A332695 A301307 A277418 * A147539 A266610 A156276
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 15 2018
STATUS
approved