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A301903
Number of nX5 0..1 arrays with every element equal to 0, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.
1
1, 3, 2, 8, 12, 64, 196, 864, 3236, 13280, 52260, 210400, 838180, 3358176, 13419044, 53698016, 214737444, 859037152, 3435930148, 13744070112, 54975406628, 219903024608, 879608603172, 3518440005088, 14073746039332, 56295006526944
OFFSET
1,2
COMMENTS
Column 5 of A301906.
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) +5*a(n-2) -20*a(n-3) -4*a(n-4) +16*a(n-5) for n>6
EXAMPLE
Some solutions for n=5
..0..1..1..1..1. .0..1..1..0..0. .0..1..0..1..0. .0..1..1..0..0
..1..1..0..1..1. .1..1..0..0..0. .0..1..0..1..0. .1..1..0..0..1
..1..1..0..1..1. .0..1..1..0..1. .0..1..0..1..0. .0..1..0..0..0
..1..1..0..1..1. .1..1..0..0..0. .0..1..0..1..0. .0..1..1..0..0
..1..1..1..1..0. .0..1..0..0..1. .0..1..0..1..0. .1..1..0..0..1
CROSSREFS
Cf. A301906.
Sequence in context: A094188 A088551 A373288 * A165660 A171634 A107300
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 28 2018
STATUS
approved