A207296 Number of (n+1)X3 0..3 arrays with rows and columns of determinants of all 2X2 subblocks lexicographically nondecreasing

2338, 93991, 2019514, 33860323, 521236935, 8125554503, 129766993681, 2097529018861, 34031232967856, 552743117801949, 8980781167531052, 145936287642008829, 2371573852386690882, 38540844929539700726

Offset

1,1

Comments

Column 2 of A207300

Links

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

Formula

Empirical: a(n) = 24*a(n-1) -102*a(n-2) -656*a(n-3) +4911*a(n-4) -9576*a(n-5) +5400*a(n-6) for n>28

Example

Some solutions for n=4
..3..3..3....3..0..0....0..2..2....1..1..3....0..0..1....2..3..2....2..1..1
..2..0..0....2..0..1....1..1..0....3..0..0....0..0..3....0..0..0....0..0..0
..3..0..3....0..0..2....1..1..2....0..0..3....3..0..0....3..2..3....3..1..3
..2..1..0....1..0..0....2..3..0....2..0..3....3..0..1....0..0..0....3..1..3
..2..3..3....1..0..2....0..1..1....3..0..1....1..0..3....2..3..0....3..1..3

Crossrefs

Sequence in context: A237387 A212466 A205021 * A043440 A023938 A132204

Adjacent sequences: A207293 A207294 A207295 * A207297 A207298 A207299

Keyword

nonn

Author

R. H. Hardin Feb 16 2012

Status

approved