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A302467 Number of nX3 0..1 arrays with every element equal to 1, 2, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
1, 14, 49, 250, 1147, 5486, 25599, 121626, 572657, 2702270, 12758927, 60200726, 284075917, 1340774674, 6327058239, 29858586774, 140911377557, 664983975698, 3138197357535, 14809850612998, 69890644606749, 329828551233330 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A302472.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +9*a(n-2) +15*a(n-3) -68*a(n-4) -132*a(n-5) +96*a(n-6) +136*a(n-7) -34*a(n-8) -276*a(n-9) +188*a(n-10) -8*a(n-11) +32*a(n-12) -16*a(n-13) +64*a(n-14)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302472.

Sequence in context: A308834 A084049 A251221 * A303249 A215569 A246973

Adjacent sequences:  A302464 A302465 A302466 * A302468 A302469 A302470

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 08 2018

STATUS

approved

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Last modified August 18 07:30 EDT 2019. Contains 326072 sequences. (Running on oeis4.)