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A299454
Number of nX4 0..1 arrays with every element equal to 0, 2, 3, 5, 6 or 8 king-move adjacent elements, with upper left element zero.
1
1, 18, 19, 48, 175, 508, 1522, 5065, 16968, 56041, 187865, 632318, 2129542, 7184550, 24247946, 81877297, 276519444, 934064187, 3155663032, 10661937499, 36024652028, 121723990676, 411304232139, 1389808116350, 4696240793449
OFFSET
1,2
COMMENTS
Column 4 of A299458.
FORMULA
Empirical recurrence of order 70 (see link above)
EXAMPLE
Some solutions for n=7
..0..0..0..0. .0..1..0..1. .0..0..0..0. .0..0..0..0. .0..0..1..1
..0..0..0..0. .0..0..0..0. .0..0..0..0. .0..1..1..0. .0..1..0..1
..0..0..0..0. .0..1..1..1. .1..1..1..1. .1..0..0..1. .0..1..1..0
..0..0..0..0. .0..1..1..1. .1..1..1..1. .1..1..1..1. .0..0..0..0
..0..0..0..0. .0..1..1..1. .0..0..0..0. .0..0..0..0. .1..1..1..1
..0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0. .1..1..1..1
..0..0..0..0. .0..1..0..1. .0..0..0..0. .0..0..0..0. .1..1..1..1
CROSSREFS
Cf. A299458.
Sequence in context: A041650 A041648 A034122 * A041664 A041662 A300092
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 10 2018
STATUS
approved