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A304226 Number of nX4 0..1 arrays with every element unequal to 0, 1, 2 or 7 king-move adjacent elements, with upper left element zero. 1
8, 5, 6, 11, 20, 46, 97, 189, 395, 836, 1701, 3492, 7284, 15033, 30913, 63989, 132350, 272947, 563756, 1165374, 2406457, 4969281, 10266751, 21207248, 43798629, 90470888, 186881300, 385997321, 797284757, 1646862265, 3401654354, 7026194587 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A304230.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +5*a(n-3) -4*a(n-6) for n>8

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304230.

Sequence in context: A099002 A021898 A020786 * A019868 A121472 A117039

Adjacent sequences:  A304223 A304224 A304225 * A304227 A304228 A304229

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 08 2018

STATUS

approved

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Last modified June 13 16:45 EDT 2021. Contains 345008 sequences. (Running on oeis4.)