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A299510
Number of n X 4 0..1 arrays with every element equal to 1, 2, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.
1
2, 13, 29, 112, 439, 1950, 7702, 30277, 126429, 518642, 2100761, 8578886, 35145230, 143528336, 585829218, 2394199252, 9784418458, 39968678821, 163285521413, 667170458474, 2725830500324, 11136404253818, 45499237305554
OFFSET
1,1
COMMENTS
Column 4 of A299514.
FORMULA
Empirical recurrence of order 68 (see link above).
EXAMPLE
Some solutions for n=5
..0..1..1..0. .0..0..0..1. .0..1..1..1. .0..1..1..0. .0..1..1..0
..0..0..0..1. .1..1..1..1. .0..0..0..0. .0..0..0..0. .0..0..0..1
..0..0..0..1. .0..1..1..1. .0..0..0..1. .0..0..0..0. .0..0..0..1
..0..0..0..0. .0..1..1..1. .0..0..0..1. .0..0..0..0. .0..0..0..1
..0..1..1..1. .1..0..0..1. .0..1..1..0. .0..1..1..0. .0..1..1..0
CROSSREFS
Cf. A299514.
Sequence in context: A253970 A361836 A298392 * A299310 A300111 A030452
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 11 2018
STATUS
approved