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A304592 Number of nX3 0..1 arrays with every element unequal to 1, 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero. 1
1, 23, 82, 456, 2207, 10949, 54357, 269732, 1337127, 6635686, 32914816, 163277978, 810008547, 4018201206, 19933310071, 98884549774, 490541211576, 2433455551301, 12071779000380, 59885128155030, 297075468364227, 1473718630523999 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 3 of A304597.
LINKS
FORMULA
Empirical: a(n) = 3*a(n-1) +9*a(n-2) +13*a(n-3) -38*a(n-4) -46*a(n-5) +28*a(n-6) -45*a(n-7) -54*a(n-8) -34*a(n-9) +8*a(n-10) +26*a(n-11) -37*a(n-12) -7*a(n-13) -3*a(n-14) +2*a(n-15) for n>16
EXAMPLE
Some solutions for n=5
..0..0..0. .0..1..0. .0..1..0. .0..0..1. .0..1..0. .0..1..0. .0..0..1
..1..0..1. .0..0..1. .1..0..0. .0..1..1. .0..1..0. .0..1..1. .0..1..0
..1..1..0. .0..1..0. .1..1..0. .0..0..0. .1..0..0. .0..1..1. .0..1..0
..0..1..0. .1..0..0. .0..1..1. .0..0..0. .0..0..1. .0..1..0. .1..0..0
..0..1..1. .0..1..0. .0..1..0. .1..1..0. .0..1..1. .1..1..0. .0..1..1
CROSSREFS
Cf. A304597.
Sequence in context: A280576 A160297 A210706 * A302729 A139940 A052073
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 15 2018
STATUS
approved

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Last modified March 28 10:31 EDT 2024. Contains 371240 sequences. (Running on oeis4.)