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A187406 Number of (n+1)X(n+1) 0..6 arrays with diagonal zero and the i,j-th 2X2 subblock sum equal to the j,i-th 2X2 subblock sum 0
49, 9331, 8583967, 41906480269, 1150080863229361, 184765819216226770459 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A187408

LINKS

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

EXAMPLE

Some solutions for 4X4

..0..0..0..2....0..0..3..0....0..0..0..5....0..0..3..0....0..0..0..4

..3..0..5..0....2..0..4..1....2..0..6..2....5..0..3..5....3..0..6..1

..2..0..0..3....3..2..0..0....0..4..0..5....0..1..0..0....1..2..0..4

..3..2..6..0....3..0..3..0....5..4..5..0....5..5..2..0....4..4..5..0

CROSSREFS

Sequence in context: A180273 A351598 A014801 * A094199 A194023 A195273

Adjacent sequences:  A187403 A187404 A187405 * A187407 A187408 A187409

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 09 2011

STATUS

approved

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Last modified August 19 07:13 EDT 2022. Contains 356216 sequences. (Running on oeis4.)