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A298392
Number of nX4 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero.
1
2, 13, 29, 112, 432, 1915, 7556, 29657, 123601, 506005, 2045992, 8338063, 34081117, 138882034, 565662142, 2306767356, 9406512939, 38341596638, 156298964930, 637236157303, 2597868552855, 10590565910150, 43175175465961
OFFSET
1,1
COMMENTS
Column 4 of A298396.
FORMULA
Empirical recurrence of order 68 (see link above)
EXAMPLE
Some solutions for n=5
..0..1..0..1. .0..0..0..1. .0..0..1..1. .0..0..1..0. .0..1..0..1
..0..0..1..1. .1..1..1..1. .1..1..0..0. .1..0..1..0. .1..0..1..1
..0..0..1..1. .0..1..1..1. .0..0..0..1. .1..0..0..1. .0..0..1..1
..1..0..1..0. .1..0..1..0. .0..1..0..1. .0..0..0..1. .0..0..1..0
..1..0..0..0. .1..0..1..0. .1..1..0..0. .1..1..0..1. .0..1..0..1
CROSSREFS
Cf. A298396.
Sequence in context: A141336 A253970 A361836 * A299510 A299310 A300111
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 18 2018
STATUS
approved