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A297870 Number of nX2 0..1 arrays with every element equal to 2, 3 or 5 king-move adjacent elements, with upper left element zero. 9
0, 1, 3, 2, 11, 13, 34, 65, 123, 266, 499, 1037, 2042, 4089, 8219, 16338, 32827, 65485, 131090, 262193, 524155, 1048794, 2096899, 4194509, 8388586, 16776937, 33555099, 67107874, 134218827, 268434701, 536870786, 1073743393, 2147480443, 4294971818 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 2 of A297876.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +3*a(n-2) -4*a(n-4)

EXAMPLE

Some solutions for n=7

..0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0

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

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

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

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

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

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

CROSSREFS

Cf. A297876.

Sequence in context: A134426 A122672 A194608 * A052973 A087956 A116391

Adjacent sequences:  A297867 A297868 A297869 * A297871 A297872 A297873

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 07 2018

STATUS

approved

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Last modified June 20 13:04 EDT 2021. Contains 345164 sequences. (Running on oeis4.)