A206466 - OEIS

A206466

Number of (n+1) X 3 0..2 arrays with every 2 X 2 subblock having zero permanent.

121, 1411, 11025, 106891, 958441, 8963667, 82609921, 767387611, 7109019225, 65954564131, 611588125681, 5672733227307, 52611971134921, 487976540781811, 4525907460768225, 41977494854894971, 389337236836785721

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OFFSET

1,1

COMMENTS

Column 2 of A206472.

LINKS

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

FORMULA

Empirical: a(n) = 11*a(n-1) - 176*a(n-3) + 256*a(n-4).

Empirical g.f.: x*(121 + 80*x - 4496*x^2 + 6912*x^3) / ((1 - 4*x)*(1 + 4*x)*(1 - 11*x + 16*x^2)). - Colin Barker, Jun 16 2018

EXAMPLE

Some solutions for n=4:

2 2 1 2 1 0 2 2 1 0 0 0 0 0 1 0 0 0 2 0 1

0 0 0 0 0 0 0 0 0 1 2 0 1 0 1 0 1 2 2 0 1

0 0 2 1 1 0 2 1 1 0 0 0 2 0 2 0 0 0 1 0 1

2 0 1 0 0 0 0 0 0 1 1 2 0 0 1 2 1 2 0 0 1

0 0 2 0 0 2 1 1 0 0 0 0 1 0 0 0 0 0 2 0 1

CROSSREFS

Cf. A206472.

Sequence in context: A254970 A036308 A066444 * A137434 A175111 A375917

Adjacent sequences: A206463 A206464 A206465 * A206467 A206468 A206469

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 08 2012

STATUS

approved