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A302462
Number of 4Xn 0..1 arrays with every element equal to 0, 2, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
1
8, 3, 55, 10, 233, 123, 1518, 2945, 16711, 58462, 256863, 1039347, 4337252, 17926079, 74303683, 307706930, 1274892369, 5281342547, 21882023418, 90662172089, 375642965369, 1556440391546, 6448902902619, 26720451492533, 110713137717160
OFFSET
1,1
COMMENTS
Row 4 of A302460.
FORMULA
Empirical recurrence of order 71 (see link above)
EXAMPLE
Some solutions for n=5
..0..0..0..1..1. .0..0..1..1..1. .0..0..1..1..0. .0..1..1..0..1
..1..0..1..1..1. .0..0..0..1..0. .0..0..1..1..1. .1..1..0..0..0
..1..0..0..1..0. .0..0..0..1..1. .0..0..1..1..1. .0..0..0..1..1
..1..0..0..1..0. .0..0..1..1..1. .1..0..0..1..1. .1..0..1..1..0
CROSSREFS
Cf. A302460.
Sequence in context: A286034 A256046 A197245 * A303244 A038281 A302370
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 08 2018
STATUS
approved