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A187456 Number of (n+1)X(n+1) 0..4 arrays with the array of 2X2 subblock determinants symmetric 0
625, 187525, 450657775, 3764498129375, 268361727217027575 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A187457

LINKS

Table of n, a(n) for n=1..5.

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

Sequence in context: A223230 A017584 A223260 * A223318 A222278 A120320

Adjacent sequences:  A187453 A187454 A187455 * A187457 A187458 A187459

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 10 2011

STATUS

approved

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Last modified October 22 15:40 EDT 2021. Contains 348172 sequences. (Running on oeis4.)