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A300347
Number of nX5 0..1 arrays with every element equal to 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1
3, 37, 57, 152, 306, 729, 1496, 3223, 6893, 14847, 31957, 68842, 148439, 320256, 691019, 1491306, 3218713, 6947412, 14996127, 32370115, 69873873, 150830506, 325586292, 702821226, 1517137602, 3274960728, 7069488750, 15260562309
OFFSET
1,1
COMMENTS
Column 5 of A300350.
LINKS
FORMULA
Empirical: a(n) = 5*a(n-1) -8*a(n-2) +4*a(n-3) +a(n-6) -3*a(n-7) +4*a(n-8) -2*a(n-9) +a(n-10) -a(n-11) -a(n-14) +a(n-15) for n>19
EXAMPLE
Some solutions for n=5
..0..0..0..0..1. .0..0..1..1..1. .0..0..1..0..0. .0..1..1..0..1
..1..1..1..0..1. .1..0..0..0..0. .0..1..0..1..1. .0..0..1..0..1
..0..0..1..0..1. .1..1..1..1..1. .1..0..1..0..0. .1..0..1..0..1
..0..1..0..1..0. .0..0..0..0..0. .1..1..0..1..1. .1..1..0..1..0
..1..0..1..0..0. .1..1..1..1..0. .0..0..1..0..0. .0..0..1..0..0
CROSSREFS
Cf. A300350.
Sequence in context: A286637 A106996 A338751 * A047691 A323829 A139842
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 03 2018
STATUS
approved