login
A298439
Number of nX3 0..1 arrays with every element equal to 0, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.
1
1, 1, 11, 2, 27, 36, 86, 162, 368, 727, 1536, 3227, 6657, 14037, 29089, 61102, 127035, 266162, 554714, 1160052, 2421034, 5058677, 10563272, 22064711, 46083287, 96250175, 201033571, 419875536, 876978777, 1831656308, 3825692016, 7990395794
OFFSET
1,3
COMMENTS
Column 3 of A298444.
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +3*a(n-2) -4*a(n-3) -4*a(n-4) -2*a(n-5) +2*a(n-6) +5*a(n-7) -2*a(n-8) +6*a(n-9) -a(n-10) -a(n-11) -a(n-12) for n>13
EXAMPLE
Some solutions for n=5
..0..0..0. .0..0..1. .0..1..1. .0..1..1. .0..0..0. .0..0..1. .0..1..0
..0..0..0. .0..0..0. .1..1..1. .1..1..1. .0..0..0. .0..0..0. .1..1..1
..1..0..1. .1..0..1. .0..1..0. .1..0..1. .1..0..1. .0..1..0. .1..0..1
..0..0..0. .0..0..0. .1..1..1. .1..1..1. .0..0..0. .0..0..0. .1..1..1
..0..0..1. .0..0..1. .1..1..0. .0..1..1. .1..0..0. .1..0..0. .0..1..0
CROSSREFS
Cf. A298444.
Sequence in context: A051309 A077344 A364697 * A095157 A110767 A089365
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 19 2018
STATUS
approved