A187454 Number of (n+1)X(n+1) 0..2 arrays with the array of 2X2 subblock determinants symmetric

81, 5175, 1293651, 983320335, 2806943351103, 25357269654789183, 816485466267634598145

Offset

1,1

Comments

Column 2 of A187457

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for 4X4
..0..0..2..0....0..0..2..0....0..0..0..1....0..0..2..1....0..0..2..0
..2..1..1..2....0..0..2..1....1..1..0..0....1..0..0..0....1..0..1..2
..2..0..1..0....2..2..0..0....0..0..0..1....1..0..1..0....2..0..0..0
..2..2..0..0....0..1..0..0....2..0..1..1....1..0..1..2....0..2..0..2

Crossrefs

Sequence in context: A205285 A222166 A219728 * A206406 A238172 A260858

Adjacent sequences: A187451 A187452 A187453 * A187455 A187456 A187457

Keyword

nonn

Author

R. H. Hardin Mar 10 2011

Status

approved