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A304225 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2 or 7 king-move adjacent elements, with upper left element zero. 1
4, 3, 5, 6, 11, 16, 22, 33, 49, 71, 104, 153, 224, 328, 481, 705, 1033, 1514, 2219, 3252, 4766, 6985, 10237, 15003, 21988, 32225, 47228, 69216, 101441, 148669, 217885, 319326, 467995, 685880, 1005206, 1473201, 2159081, 3164287, 4637488, 6796569 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A304230.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-3) for n>5

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304230.

Sequence in context: A328109 A000211 A059902 * A068982 A317530 A171021

Adjacent sequences:  A304222 A304223 A304224 * A304226 A304227 A304228

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 08 2018

STATUS

approved

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Last modified September 18 20:19 EDT 2020. Contains 337173 sequences. (Running on oeis4.)