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A302261 Number of nX4 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
8, 105, 772, 5922, 45717, 353229, 2727755, 21069318, 162753849, 1257225302, 9711792270, 75021745843, 579529894725, 4476770505137, 34582309009590, 267142643360807, 2063633101348406, 15941227812038514, 123143376763267969 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A302265.

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) -2*a(n-2) -51*a(n-3) -80*a(n-4) -11*a(n-5) +262*a(n-6) +1203*a(n-7) -73*a(n-8) -847*a(n-9) -3807*a(n-10) +103*a(n-11) -606*a(n-12) +4295*a(n-13) +1436*a(n-14) +1630*a(n-15) -3052*a(n-16) +576*a(n-17) for n>18

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302265.

Sequence in context: A285745 A119934 A247537 * A302961 A302804 A303465

Adjacent sequences:  A302258 A302259 A302260 * A302262 A302263 A302264

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 04 2018

STATUS

approved

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Last modified October 19 03:34 EDT 2019. Contains 328211 sequences. (Running on oeis4.)