A205057 Number of (n+1)X2 0..2 arrays with rows and columns of permanents of all 2X2 subblocks lexicographically nondecreasing

81, 491, 2830, 14206, 68508, 311076, 1375313, 5904417, 24933375, 103696183, 427081054, 1744729352, 7088213440, 28671903248, 115624112159, 465198328593, 1868598182563, 7496692149869, 30050430752062, 120382149539840

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