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A204734 Number of (n+1)X3 0..1 arrays with rows and columns of permanents of all 2X2 subblocks lexicographically nondecreasing, and all 2X2 permanents nonzero 1
15, 43, 115, 304, 787, 2033, 5219, 13398, 34331, 87991, 225395, 577452, 1479139, 3789069, 9705763, 24862194, 63685419, 163134387, 417876275, 1070414056, 2741919411, 7023575913, 17991253859, 46085557838, 118050573627, 302392805359 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A204740

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) -2*a(n-2) -8*a(n-3) +11*a(n-4) -4*a(n-5).

Empirical G.f.: x*(15-17*x-27*x^2+50*x^3-20*x^4)/((1-x)^3*(1-x-4*x^2)). [Colin Barker, Jan 19 2012]

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A137183 A173873 A124708 * A126369 A193647 A133343

Adjacent sequences:  A204731 A204732 A204733 * A204735 A204736 A204737

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 18 2012

STATUS

approved

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Last modified November 14 04:40 EST 2019. Contains 329108 sequences. (Running on oeis4.)