login
A316691
Number of nX6 0..1 arrays with every element unequal to 0, 1, 2, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
1
32, 13, 42, 125, 359, 2081, 9442, 38020, 174483, 785604, 3427907, 15257880, 67982637, 300964560, 1335669886, 5933105093, 26325240756, 116828769988, 518611346889, 2301753155715, 10215798261389, 45343030343793
OFFSET
1,1
COMMENTS
Column 6 of A316693.
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +5*a(n-2) +33*a(n-3) -9*a(n-4) -53*a(n-5) -229*a(n-6) +42*a(n-7) +42*a(n-8) +386*a(n-9) -47*a(n-10) -52*a(n-11) -288*a(n-12) +62*a(n-13) +216*a(n-15) +84*a(n-16) for n>21
EXAMPLE
Some solutions for n=5
..0..0..0..0..0..1. .0..0..0..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..1..1..0. .0..0..1..0..1..0
..0..0..0..0..0..0. .0..0..0..1..0..0. .0..0..0..0..0..0. .0..1..0..0..0..0
..0..0..0..0..1..0. .0..0..0..0..1..0. .0..1..0..0..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
CROSSREFS
Cf. A316693.
Sequence in context: A304228 A305038 A305584 * A275470 A162884 A029771
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 10 2018
STATUS
approved