

A305637


Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 4, 5 or 6 kingmove adjacent elements, with upper left element zero.


1



4, 14, 29, 78, 255, 743, 2197, 6663, 20052, 60193, 181342, 546463, 1645639, 4957325, 14936474, 45001409, 135584151, 408514453, 1230861778, 3708615800, 11174194280, 33668360081, 101444455039, 305657427545, 920962321425, 2774910487762
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OFFSET

1,1


COMMENTS

Column 3 of A305642.


LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210


FORMULA

Empirical: a(n) = 2*a(n1) +3*a(n2) +9*a(n3) 11*a(n4) 37*a(n5) 56*a(n6) +14*a(n7) +135*a(n8) +177*a(n9) +40*a(n10) 179*a(n11) 188*a(n12) 61*a(n13) +34*a(n14) +3*a(n15) for n>17


EXAMPLE

Some solutions for n=5
..0..0..1. .0..1..1. .0..0..0. .0..1..0. .0..0..0. .0..1..1. .0..0..0
..1..1..1. .0..1..1. .1..0..0. .0..0..0. .0..0..1. .0..0..0. .0..0..0
..1..1..1. .1..1..1. .1..0..0. .0..0..0. .1..0..0. .0..0..0. .0..0..0
..0..1..0. .1..1..1. .1..1..0. .0..0..0. .1..0..1. .1..0..0. .0..0..0
..0..1..0. .1..1..1. .1..1..0. .0..1..0. .1..1..0. .1..0..0. .0..0..0


CROSSREFS

Cf. A305642.
Sequence in context: A338311 A244714 A218212 * A103779 A049451 A079776
Adjacent sequences: A305634 A305635 A305636 * A305638 A305639 A305640


KEYWORD

nonn


AUTHOR

R. H. Hardin, Jun 07 2018


STATUS

approved



