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A298456 Number of nX3 0..1 arrays with every element equal to 2, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero. 1
0, 3, 8, 30, 153, 710, 3490, 17087, 84008, 413964, 2040233, 10061180, 49619258, 244733629, 1207118898, 5954066110, 29368423541, 144860206974, 714526449382, 3524421573945, 17384313721480, 85748656629026, 422957892588941 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 3 of A298461.
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) +10*a(n-2) -19*a(n-3) -42*a(n-4) +17*a(n-5) +27*a(n-6) -39*a(n-7) +45*a(n-8) +75*a(n-9) -35*a(n-10) -6*a(n-11) +6*a(n-12) -8*a(n-13) for n>15
EXAMPLE
Some solutions for n=7
..0..1..1. .0..0..1. .0..0..0. .0..0..1. .0..0..0. .0..0..0. .0..0..0
..0..0..1. .0..1..1. .0..1..0. .0..1..1. .0..0..1. .1..0..0. .0..1..0
..0..0..1. .1..1..1. .1..0..1. .0..0..1. .0..1..1. .1..1..0. .0..1..1
..1..0..1. .1..1..0. .1..1..1. .0..1..1. .1..1..0. .1..1..0. .1..0..1
..1..1..0. .1..0..0. .0..0..0. .0..0..1. .0..0..0. .1..0..0. .0..1..0
..1..0..0. .1..1..0. .1..0..1. .1..1..0. .1..0..0. .1..0..0. .1..0..1
..1..1..0. .1..1..1. .1..1..1. .1..0..0. .1..1..0. .1..1..0. .1..1..1
CROSSREFS
Cf. A298461.
Sequence in context: A078619 A274934 A066304 * A145776 A066165 A323775
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 19 2018
STATUS
approved

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Last modified March 4 08:20 EST 2024. Contains 370522 sequences. (Running on oeis4.)