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A298215
Number of nX2 0..1 arrays with every element equal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.
8
2, 7, 13, 29, 73, 157, 353, 869, 1993, 4557, 10993, 25909, 60313, 144157, 343233, 809349, 1929833, 4610157, 10953873, 26130389, 62487353, 149069757, 356015713, 851720229, 2035889673, 4867238157, 11647445553, 27867454069, 66671141593
OFFSET
1,1
COMMENTS
Column 2 of A298221.
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) -5*a(n-2) +10*a(n-3) -24*a(n-4) +16*a(n-5) for n>6
EXAMPLE
Some solutions for n=7
..0..1. .0..1. .0..1. .0..1. .0..0. .0..0. .0..0. .0..1. .0..0. .0..0
..0..0. .0..0. .0..0. .1..0. .0..1. .0..1. .1..1. .1..1. .1..0. .1..1
..0..0. .0..0. .0..0. .1..0. .0..0. .1..1. .0..0. .0..0. .1..1. .0..1
..1..0. .1..0. .0..1. .1..0. .0..0. .1..1. .1..0. .0..1. .1..1. .0..0
..0..0. .1..1. .1..1. .0..1. .0..0. .1..1. .1..1. .0..0. .1..0. .1..1
..1..1. .1..1. .0..0. .1..0. .0..1. .1..0. .0..0. .1..1. .1..1. .0..1
..0..1. .0..1. .0..1. .0..1. .1..1. .1..1. .1..1. .0..0. .0..0. .1..1
CROSSREFS
Cf. A298221.
Sequence in context: A141777 A297883 A215206 * A127396 A294839 A373306
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 15 2018
STATUS
approved