

A304349


Number of nX2 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 kingmove adjacent elements, with upper left element zero.


8



2, 5, 9, 21, 57, 125, 289, 741, 1737, 4045, 9969, 23861, 56217, 135965, 326849, 776581, 1864297, 4479085, 10691729, 25606101, 61438777, 146972605, 351821409, 843331621, 2019112457, 4833683725, 11580336689, 27733236341, 66402706137
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OFFSET

1,1


COMMENTS

Column 2 of A304355.


LINKS

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


FORMULA

Empirical: a(n) = 2*a(n1) a(n2) +8*a(n3) 8*a(n4)


EXAMPLE

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


CROSSREFS

Cf. A304355.
Sequence in context: A155042 A001851 A303963 * A024822 A218966 A029726
Adjacent sequences: A304346 A304347 A304348 * A304350 A304351 A304352


KEYWORD

nonn


AUTHOR

R. H. Hardin, May 11 2018


STATUS

approved



