A206217 Number of (n+1)X3 0..2 arrays with rows and columns of determinants of all 2X2 subblocks lexicographically nondecreasing

452, 7313, 73133, 656053, 5862927, 53835891, 499752207, 4654712482, 43385661909, 404522337676, 3772143906359, 35177251141094, 328055398640436, 3059417909281589, 28532069184985757, 266090406288547230

Offset

1,1

Comments

Column 2 of A206223

Links

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

Formula

Empirical: a(n) = 15*a(n-1) -49*a(n-2) -97*a(n-3) +664*a(n-4) -980*a(n-5) +448*a(n-6) for n>16

Example

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

Crossrefs

Sequence in context: A205209 A236665 A318627 * A233228 A233145 A233237

Adjacent sequences: A206214 A206215 A206216 * A206218 A206219 A206220

Keyword

nonn

Author

R. H. Hardin Feb 04 2012

Status

approved