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A207141 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor 0
50, 48, 157, 190, 622, 754, 2482, 3010, 9922, 12034, 39682, 48130, 158722, 192514, 634882, 770050, 2539522, 3080194, 10158082, 12320770, 40632322, 49283074, 162529282, 197132290 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A207149

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A244277 A248688 A291495 * A256958 A165871 A171652

Adjacent sequences:  A207138 A207139 A207140 * A207142 A207143 A207144

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 15 2012

STATUS

approved

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Last modified October 17 18:58 EDT 2019. Contains 328127 sequences. (Running on oeis4.)