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A206217 Number of (n+1)X3 0..2 arrays with rows and columns of determinants of all 2X2 subblocks lexicographically nondecreasing 1
452, 7313, 73133, 656053, 5862927, 53835891, 499752207, 4654712482, 43385661909, 404522337676, 3772143906359, 35177251141094, 328055398640436, 3059417909281589, 28532069184985757, 266090406288547230 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A206223
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 04 2012
STATUS
approved

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Last modified July 13 18:16 EDT 2024. Contains 374285 sequences. (Running on oeis4.)