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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 06 2011
STATUS
approved

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Last modified March 29 10:59 EDT 2024. Contains 371277 sequences. (Running on oeis4.)