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A304005
Number of nX3 0..1 arrays with every element unequal to 0, 2, 3 or 5 king-move adjacent elements, with upper left element zero.
2
1, 7, 13, 21, 27, 53, 99, 197, 371, 713, 1365, 2645, 5105, 9857, 19079, 36861, 71379, 138165, 267465, 518201, 1003521, 1944649, 3767939, 7302057, 14153291, 27432325, 53179669, 103092661, 199871009, 387518385, 751360183, 1456897269, 2824988675
OFFSET
1,2
COMMENTS
Column 3 of A304010.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +5*a(n-2) -a(n-3) -12*a(n-4) -2*a(n-5) +10*a(n-6) +2*a(n-7) +a(n-8) +7*a(n-9) -3*a(n-10) -19*a(n-11) -2*a(n-12) +2*a(n-13) -4*a(n-14) +10*a(n-15) +6*a(n-16) for n>17
EXAMPLE
Some solutions for n=5
..0..1..0. .0..1..0. .0..0..0. .0..1..0. .0..0..0. .0..0..0. .0..0..0
..0..1..1. .1..1..1. .0..0..0. .1..1..1. .1..1..1. .1..1..1. .0..0..0
..1..0..0. .0..0..0. .0..0..0. .1..0..1. .1..1..1. .0..1..0. .0..0..0
..1..1..0. .0..0..0. .0..0..0. .0..0..0. .1..1..1. .0..0..0. .1..1..1
..0..1..0. .1..1..1. .1..1..1. .1..1..1. .0..0..0. .1..0..1. .0..1..0
CROSSREFS
Cf. A304010.
Sequence in context: A269704 A157971 A135275 * A304947 A013652 A099988
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 04 2018
STATUS
approved