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A305956 Number of nX3 0..1 arrays with every element unequal to 1, 2, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero. 1
1, 25, 132, 919, 6030, 39985, 264680, 1752681, 11604776, 76839977, 508784004, 3368840487, 22306294686, 147697925509, 977960616520, 6475425877913, 42876103097980, 283897963371645, 1879789621111676, 12446757199974599 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A305961.

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +17*a(n-2) +14*a(n-3) -54*a(n-4) -135*a(n-5) -107*a(n-6) -58*a(n-7) -39*a(n-8) -11*a(n-9) for n>10

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A305961.

Sequence in context: A232873 A232856 A232792 * A317217 A147489 A156158

Adjacent sequences:  A305953 A305954 A305955 * A305957 A305958 A305959

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 15 2018

STATUS

approved

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Last modified July 12 21:31 EDT 2020. Contains 335669 sequences. (Running on oeis4.)