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A304414 Number of nX3 0..1 arrays with every element unequal to 0, 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero. 2
1, 8, 23, 103, 520, 2671, 13876, 72399, 378321, 1979531, 10361881, 54254622, 284118654, 1487964150, 7792975441, 40815315514, 213770499606, 1119631248273, 5864130051553, 30713754006040, 160865382297683, 842543809330756 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A304419.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) +7*a(n-2) -16*a(n-3) -78*a(n-4) -11*a(n-5) +133*a(n-6) +161*a(n-7) +58*a(n-8) -114*a(n-9) -121*a(n-10) -91*a(n-11) -47*a(n-12) -12*a(n-13) +4*a(n-14) +8*a(n-15) for n>17

EXAMPLE

Some solutions for n=5

..0..0..1. .0..1..0. .0..1..0. .0..1..0. .0..0..1. .0..0..1. .0..1..1

..1..1..0. .0..1..1. .1..1..1. .0..1..1. .1..1..0. .0..0..1. .1..0..0

..0..0..1. .1..1..0. .1..0..0. .1..0..0. .1..0..1. .1..1..1. .1..0..0

..0..1..1. .0..0..0. .0..0..1. .0..0..1. .1..0..0. .0..0..0. .1..1..1

..0..1..0. .1..1..1. .1..0..1. .1..1..0. .1..0..1. .1..0..1. .0..0..0

CROSSREFS

Cf. A304419.

Sequence in context: A036562 A320310 A303720 * A305949 A220973 A233470

Adjacent sequences:  A304411 A304412 A304413 * A304415 A304416 A304417

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 12 2018

STATUS

approved

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Last modified July 2 13:15 EDT 2022. Contains 355007 sequences. (Running on oeis4.)