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A301350
Number of nX4 0..1 arrays with every element equal to 1, 2, 3, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1
2, 30, 277, 2349, 19561, 165010, 1392131, 11741731, 99032014, 835272398, 7045026710, 59420627072, 501178143148, 4227144439913, 35653491957422, 300716364726693, 2536366776713612, 21392771375921024, 180435523636242529
OFFSET
1,1
COMMENTS
Column 4 of A301354.
FORMULA
Empirical recurrence of order 72 (see link above)
EXAMPLE
Some solutions for n=5
..0..0..0..0. .0..0..1..1. .0..0..1..1. .0..0..0..0. .0..1..1..0
..1..0..1..1. .0..1..0..0. .0..1..0..0. .1..1..1..1. .0..0..1..0
..1..0..0..1. .0..1..0..0. .1..0..0..1. .0..1..0..0. .1..1..0..0
..1..1..0..1. .1..0..0..1. .0..1..1..1. .0..1..0..0. .1..0..1..0
..0..0..1..1. .1..1..1..1. .1..0..0..1. .0..1..1..0. .0..1..0..0
CROSSREFS
Cf. A301354.
Sequence in context: A300423 A300685 A300608 * A036351 A189770 A245020
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 19 2018
STATUS
approved