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A316817 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero. 1
4, 30, 169, 983, 5701, 33046, 191692, 1111756, 6447926, 37397230, 216897344, 1257968840, 7296014816, 42315682206, 245424008900, 1423418944526, 8255595991972, 47881100579920, 277702517408082, 1610628979299244 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A316822.
LINKS
FORMULA
Empirical: a(n) = 5*a(n-1) +4*a(n-2) +9*a(n-3) -34*a(n-4) +20*a(n-5) -5*a(n-6) +4*a(n-7) -24*a(n-8) -34*a(n-9) -16*a(n-10) -8*a(n-11) for n>12
EXAMPLE
Some solutions for n=5
..0..1..0. .0..1..0. .0..0..1. .0..0..0. .0..1..0. .0..1..0. .0..1..0
..0..0..1. .1..1..0. .1..1..1. .1..0..1. .1..0..1. .1..0..1. .1..1..1
..0..0..0. .1..1..0. .1..1..1. .1..0..1. .0..0..0. .1..1..1. .1..1..1
..1..1..1. .1..0..1. .1..0..0. .1..0..1. .0..1..0. .1..1..1. .0..0..0
..1..1..0. .0..1..1. .1..1..0. .1..1..0. .0..1..1. .0..0..0. .1..0..0
CROSSREFS
Cf. A316822.
Sequence in context: A316999 A217213 A119697 * A317567 A132849 A115867
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 14 2018
STATUS
approved

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Last modified April 19 11:14 EDT 2024. Contains 371791 sequences. (Running on oeis4.)