A187456 - OEIS

A187456

Number of (n+1)X(n+1) 0..4 arrays with the array of 2X2 subblock determinants symmetric.

625, 187525, 450657775, 3764498129375, 268361727217027575

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 4 of A187457

LINKS

EXAMPLE

Some solutions for 4X4

..0..0..0..1....0..0..1..1....0..0..0..1....0..0..0..0....0..0..0..0

..0..0..0..0....0..0..0..0....0..0..0..2....0..0..0..4....0..0..0..3

..0..0..3..3....0..0..2..3....0..0..0..3....1..4..1..1....0..0..4..3

..0..0..0..0....3..0..2..4....3..0..2..4....1..4..0..3....1..3..4..4

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 10 2011

STATUS

approved