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A205207 Number of (n+1)X(n+1) 0..2 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards 0
81, 3248, 357812, 155765726, 209120030041, 1034393632508251, 14824580873279399161, 797526323055787605352015, 123972751506684583828633136175, 70684339957802747710060180358201899 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A205215

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A236894 A231768 A017797 * A254415 A017744 A232945

Adjacent sequences:  A205204 A205205 A205206 * A205208 A205209 A205210

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 23 2012

STATUS

approved

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Last modified January 21 19:33 EST 2021. Contains 340352 sequences. (Running on oeis4.)