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A183683 Number of (n+1) X 5 binary arrays with every 2 X 2 subblock nonsingular. 1
48, 208, 832, 3472, 14144, 58448, 239424, 986128, 4047680, 16650448, 68397888, 281218704, 1155579712, 4750209360, 19522035520, 80241997072, 329789811520, 1355498530256, 5571139502912, 22898117877648, 94112790021952 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A183688.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = 13*a(n-2) + 16*a(n-3).

Empirical g.f.: 16*x*(3 + 13*x + 13*x^2) / (1 - 13*x^2 - 16*x^3). - Colin Barker, Apr 04 2018

EXAMPLE

Some solutions for 3 X 5:

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

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

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

CROSSREFS

Cf. A183688.

Sequence in context: A290350 A260098 A260286 * A260240 A260062 A235759

Adjacent sequences:  A183680 A183681 A183682 * A183684 A183685 A183686

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2011

STATUS

approved

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Last modified December 7 15:24 EST 2021. Contains 349581 sequences. (Running on oeis4.)