

A304013


Number of nX2 0..1 arrays with every element unequal to 1, 2, 3 or 5 kingmove adjacent elements, with upper left element zero.


8



1, 7, 16, 45, 120, 333, 928, 2613, 7400, 21053, 60080, 171845, 492280, 1411789, 4051904, 11635413, 33424648, 96042845, 276020944, 793366629, 2280573208, 6556026349, 18847591392, 54185601013, 155783294760, 447882509949
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OFFSET

1,2


COMMENTS

Column 2 of A304019.


LINKS

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


FORMULA

Empirical: a(n) = 2*a(n1) +5*a(n2) 2*a(n3) 12*a(n4) 8*a(n5) for n>6


EXAMPLE

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


CROSSREFS

Cf. A304019.
Sequence in context: A024625 A055553 A066009 * A037241 A154141 A173661
Adjacent sequences: A304010 A304011 A304012 * A304014 A304015 A304016


KEYWORD

nonn


AUTHOR

R. H. Hardin, May 04 2018


STATUS

approved



