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A205057 Number of (n+1)X2 0..2 arrays with rows and columns of permanents of all 2X2 subblocks lexicographically nondecreasing 2
81, 491, 2830, 14206, 68508, 311076, 1375313, 5904417, 24933375, 103696183, 427081054, 1744729352, 7088213440, 28671903248, 115624112159, 465198328593, 1868598182563, 7496692149869, 30050430752062, 120382149539840 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A205063

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) -9*a(n-2) -130*a(n-3) +330*a(n-4) +668*a(n-5) -2784*a(n-6) -966*a(n-7) +11477*a(n-8) -4085*a(n-9) -26019*a(n-10) +21040*a(n-11) +31242*a(n-12) -39912*a(n-13) -14020*a(n-14) +35744*a(n-15) -6168*a(n-16) -11920*a(n-17) +6272*a(n-18) -768*a(n-19)

EXAMPLE

Some solutions for n=4

..0..1....1..2....0..2....2..0....2..2....2..1....1..1....1..2....0..1....1..0

..2..2....1..1....1..1....0..2....0..2....0..2....1..0....1..2....1..2....0..1

..0..1....1..2....2..0....2..0....2..1....2..2....1..2....2..1....2..2....1..1

..2..2....1..1....0..1....1..2....1..2....1..1....2..1....2..2....1..2....0..2

..0..1....1..2....2..2....1..2....2..2....2..2....2..2....2..2....2..2....1..2

CROSSREFS

Sequence in context: A304617 A205206 A205063 * A235756 A235531 A235527

Adjacent sequences: A205054 A205055 A205056 * A205058 A205059 A205060

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 21 2012

STATUS

approved

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Last modified March 20 22:57 EDT 2023. Contains 361392 sequences. (Running on oeis4.)