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A187453
Number of (n+1)X(n+1) 0..1 arrays with the array of 2X2 subblock determinants symmetric
0
16, 264, 10776, 1011136, 229028648, 121525356464, 153323988561520, 455805504397977992, 3209063463825423259232, 53344074954377463462263136, 2097212449015058409197692938608
OFFSET
1,1
COMMENTS
Column 1 of A187457
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 10 2011
STATUS
approved