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A302474
Number of 4Xn 0..1 arrays with every element equal to 1, 2, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
2
0, 34, 250, 1401, 10264, 78679, 584333, 4330427, 32116855, 238854305, 1774890111, 13186901755, 97987405188, 728115173717, 5410378555145, 40202636764567, 298731900955463, 2219776401635593, 16494405056538952, 122564331015474402
OFFSET
1,2
COMMENTS
Row 4 of A302472.
FORMULA
Empirical recurrence of order 63 (see link above)
EXAMPLE
Some solutions for n=5
..0..0..1..1..0. .0..1..0..0..1. .0..0..0..1..1. .0..0..1..1..0
..1..1..1..0..1. .1..0..1..1..0. .1..1..0..0..1. .1..1..1..0..0
..0..1..0..0..0. .0..0..1..1..0. .0..1..1..0..1. .1..0..1..0..1
..0..0..1..1..0. .0..1..1..0..0. .0..0..0..1..1. .0..0..0..1..0
CROSSREFS
Cf. A302472.
Sequence in context: A233300 A281052 A020872 * A183319 A190422 A209951
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 08 2018
STATUS
approved