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A297015 Number of nX3 0..1 arrays with each 1 adjacent to 3, 4 or 6 king-move neighboring 1s. 1
1, 3, 8, 14, 39, 135, 400, 1310, 4481, 15005, 50813, 173538, 590268, 2009778, 6857427, 23374979, 79672060, 271719009, 926494874, 3158768148, 10771237589, 36728205113, 125230802047, 427013571111, 1456037283696, 4964723542111 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A297020.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +5*a(n-2) +22*a(n-3) -3*a(n-4) -80*a(n-5) -161*a(n-6) -18*a(n-7) +288*a(n-8) +466*a(n-9) +118*a(n-10) -275*a(n-11) -312*a(n-12) +63*a(n-13) +36*a(n-14) -124*a(n-15) -134*a(n-16) +22*a(n-17) +68*a(n-18) -17*a(n-19) -20*a(n-20)

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A297020.

Sequence in context: A168155 A005735 A208436 * A135872 A242245 A045263

Adjacent sequences:  A297012 A297013 A297014 * A297016 A297017 A297018

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 23 2017

STATUS

approved

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Last modified October 15 04:33 EDT 2019. Contains 328026 sequences. (Running on oeis4.)