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A301961
Number of nX5 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.
1
8, 14, 41, 111, 311, 874, 2454, 6906, 19427, 54659, 153785, 432694, 1217420, 3425350, 9637573, 27116351, 76294719, 214663346, 603978142, 1699356882, 4781321499, 13452757355, 37850765441, 106497159950, 299641101508, 843072151982
OFFSET
1,1
COMMENTS
Column 5 of A301964.
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +3*a(n-2) -a(n-3) -2*a(n-4) -3*a(n-5) +2*a(n-6) for n>8
EXAMPLE
Some solutions for n=5
..0..1..0..0..1. .0..0..1..1..0. .0..0..1..0..0. .0..0..1..0..1
..0..1..1..0..1. .1..0..0..1..1. .1..0..1..1..0. .1..0..1..0..1
..0..0..1..0..1. .1..1..0..0..1. .1..0..0..1..1. .1..0..0..0..1
..1..0..1..0..1. .0..1..1..0..1. .1..1..0..0..1. .1..0..1..0..1
..1..0..1..0..1. .0..0..1..0..0. .0..1..1..0..0. .1..0..1..0..1
CROSSREFS
Cf. A301964.
Sequence in context: A144840 A257709 A121866 * A250478 A059676 A242198
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 29 2018
STATUS
approved