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A316172
Number of nX4 0..1 arrays with every element unequal to 1, 2, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
1
2, 10, 34, 72, 331, 1425, 5297, 18573, 84658, 341907, 1283578, 5514353, 22476568, 88705477, 368744149, 1503571517, 6058762423, 24862968921, 101355031741, 411492561255, 1680909735969, 6851310177747, 27886986592236, 113739441284254
OFFSET
1,1
COMMENTS
Column 4 of A316176.
FORMULA
Empirical recurrence of order 64 (see link above)
EXAMPLE
Some solutions for n=5
..0..0..0..1. .0..0..0..1. .0..1..0..0. .0..1..1..0. .0..0..0..0
..1..0..0..1. .0..1..1..1. .1..0..0..1. .0..0..0..0. .1..0..0..1
..0..0..0..0. .0..0..0..1. .0..0..0..0. .0..0..0..0. .0..0..0..0
..1..0..0..1. .1..0..1..0. .0..1..0..0. .1..0..0..1. .1..0..0..1
..0..0..1..0. .0..0..0..0. .0..0..1..0. .1..0..0..0. .0..0..0..0
CROSSREFS
Cf. A316176.
Sequence in context: A240407 A372190 A043004 * A108100 A059924 A304159
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 25 2018
STATUS
approved