A187455 Number of (n+1)X(n+1) 0..3 arrays with the array of 2X2 subblock determinants symmetric

256, 38464, 34166592, 99952737952, 1694940245504992, 98104220374911288448

Offset

1,1

Comments

Column 3 of A187457

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for 5X5
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0
..0..0..0..2..0....0..0..2..1..2....0..3..1..3..1....0..3..1..0..3
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0
..0..0..0..1..0....0..0..1..1..1....0..0..3..1..2....0..0..3..2..1

Crossrefs

Sequence in context: A207791 A018798 A017320 * A181251 A132637 A114850

Adjacent sequences: A187452 A187453 A187454 * A187456 A187457 A187458

Keyword

nonn

Author

R. H. Hardin Mar 10 2011

Status

approved