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A187698 Number of (n+1)X(n+1) 0..3 arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection 0
192, 74, 87258, 22738, 1089964504 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A187699

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for 4X4

..2..2..1..2....0..3..0..3....1..2..2..2....2..3..1..0....0..1..0..1

..3..0..3..0....2..1..2..1....2..0..2..0....1..3..0..3....3..1..3..1

..2..2..0..2....0..2..0..2....2..2..0..2....2..3..1..2....3..2..3..2

..3..0..3..2....3..2..3..3....2..0..2..1....1..3..0..3....3..1..3..1

CROSSREFS

Sequence in context: A118095 A155843 A187527 * A206343 A206336 A206335

Adjacent sequences:  A187695 A187696 A187697 * A187699 A187700 A187701

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 12 2011

STATUS

approved

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Last modified August 11 03:41 EDT 2022. Contains 356046 sequences. (Running on oeis4.)