A187453 Number of (n+1)X(n+1) 0..1 arrays with the array of 2X2 subblock determinants symmetric

16, 264, 10776, 1011136, 229028648, 121525356464, 153323988561520, 455805504397977992, 3209063463825423259232, 53344074954377463462263136, 2097212449015058409197692938608

Offset

1,1

Comments

Column 1 of A187457

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Sequence in context: A068770 A113359 A236516 * A333903 A218062 A220757

Adjacent sequences: A187450 A187451 A187452 * A187454 A187455 A187456

Keyword

nonn

Author

R. H. Hardin Mar 10 2011

Status

approved