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A297902 Number of nX3 0..1 arrays with every element equal to 0, 1, 3 or 4 king-move adjacent elements, with upper left element zero. 1
3, 3, 1, 4, 5, 5, 20, 29, 63, 156, 311, 691, 1568, 3387, 7489, 16676, 36645, 80981, 179356, 395789, 874655, 1934164, 4272847, 9442819, 20872192, 46122963, 101931201, 225279044, 497854821, 1100259109, 2431610756, 5373837917 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A297907.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +2*a(n-2) +5*a(n-3) -4*a(n-4) -7*a(n-5) -6*a(n-6) +5*a(n-7) +4*a(n-8) +a(n-9) -2*a(n-10) +a(n-11) +a(n-12) for n>13
EXAMPLE
Some solutions for n=7
..0..1..1. .0..0..1. .0..0..1. .0..1..1. .0..0..1. .0..0..1. .0..0..1
..0..1..1. .0..0..1. .0..0..1. .0..1..1. .0..0..1. .0..0..1. .0..0..1
..0..0..1. .0..1..1. .0..1..1. .0..0..1. .1..1..1. .0..1..1. .0..1..1
..0..1..1. .0..0..1. .0..1..0. .0..1..1. .0..0..1. .1..0..1. .0..1..1
..0..0..1. .0..1..1. .1..1..0. .0..1..1. .0..0..1. .0..0..1. .0..0..0
..0..1..1. .0..0..1. .1..0..0. .0..0..1. .0..1..1. .0..1..1. .0..1..1
..0..1..1. .0..0..1. .1..0..0. .0..0..1. .0..1..1. .0..1..1. .0..1..1
CROSSREFS
Cf. A297907.
Sequence in context: A258201 A164731 A226576 * A298496 A137919 A079081
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 08 2018
STATUS
approved

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Last modified May 28 15:12 EDT 2024. Contains 372916 sequences. (Running on oeis4.)