

A303963


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


8



2, 5, 9, 21, 53, 105, 237, 577, 1205, 2681, 6349, 13681, 30309, 70377, 154429, 342177, 783957, 1737881, 3857581, 8760529, 19527749, 43436873, 98090781, 219270657, 488654645, 1099633401, 2461435533, 5493590065, 12336038693, 27628989353
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OFFSET

1,1


COMMENTS

Column 2 of A303969.


LINKS

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


FORMULA

Empirical: a(n) = a(n1) +8*a(n3) 4*a(n4)


EXAMPLE

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


CROSSREFS

Cf. A303969.
Sequence in context: A117186 A155042 A001851 * A304349 A024822 A218966
Adjacent sequences: A303960 A303961 A303962 * A303964 A303965 A303966


KEYWORD

nonn


AUTHOR

R. H. Hardin, May 03 2018


STATUS

approved



