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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A304010.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

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

Adjacent sequences:  A304002 A304003 A304004 * A304006 A304007 A304008

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 04 2018

STATUS

approved

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Last modified January 16 15:53 EST 2021. Contains 340206 sequences. (Running on oeis4.)