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A299453
Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 5, 6 or 8 king-move adjacent elements, with upper left element zero.
1
1, 7, 7, 19, 35, 95, 223, 571, 1535, 4091, 11247, 31195, 86931, 244295, 688227, 1944479, 5504723, 15600559, 44253807, 125605043, 356642407, 1012929987, 2877423319, 8174903459, 23227280955, 65999249359, 187541203227, 532924811479
OFFSET
1,2
COMMENTS
Column 3 of A299458.
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) -8*a(n-3) -13*a(n-4) +20*a(n-5) +21*a(n-6) +4*a(n-7) -30*a(n-8) -44*a(n-9) -17*a(n-10) +72*a(n-11) +116*a(n-12) -20*a(n-13) -72*a(n-14) -52*a(n-15) -12*a(n-16) +24*a(n-17) +8*a(n-18) for n>19
EXAMPLE
Some solutions for n=6
..0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..1..0
..0..0..0. .0..0..0. .0..0..0. .0..0..0. .1..0..1. .0..0..0. .1..1..1
..0..0..0. .1..1..1. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..0..0
..0..0..0. .1..1..1. .1..1..1. .0..0..0. .1..1..1. .1..1..1. .0..0..0
..1..1..1. .1..1..1. .0..1..0. .0..0..0. .1..1..1. .1..1..1. .0..0..0
..1..1..1. .1..1..1. .1..1..1. .0..0..0. .1..1..1. .1..1..1. .0..0..0
CROSSREFS
Cf. A299458.
Sequence in context: A195863 A053416 A213031 * A300091 A094248 A282828
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 10 2018
STATUS
approved