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A296985 Number of nX3 0..1 arrays with each 1 adjacent to 3, 4 or 5 king-move neighboring 1s. 1
1, 4, 14, 28, 98, 447, 1653, 6507, 27374, 111866, 455776, 1879650, 7732294, 31739780, 130516126, 536728543, 2206092839, 9069307066, 37287485232, 153290332616, 630187059733, 2590803232685, 10651107068004, 43787867995065 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A296990.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +2*a(n-2) +19*a(n-3) -19*a(n-4) -52*a(n-5) -67*a(n-6) +15*a(n-7) +155*a(n-8) +207*a(n-9) -104*a(n-10) -157*a(n-11) -172*a(n-12) +53*a(n-13) +63*a(n-14) +38*a(n-15) +14*a(n-16) +19*a(n-17) +3*a(n-18) +4*a(n-19) +2*a(n-20)

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A296990.

Sequence in context: A289179 A033690 A316213 * A244714 A218212 A305637

Adjacent sequences:  A296982 A296983 A296984 * A296986 A296987 A296988

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 22 2017

STATUS

approved

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Last modified April 8 05:55 EDT 2020. Contains 333312 sequences. (Running on oeis4.)