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A213804 Number of 6X6 0..n symmetric arrays with all rows summing to 3*n 0
1760, 526443, 34725760, 932587453, 13937940952, 138198204339, 1012226679296, 5875958390949, 28376054552968, 118033137259563, 433946033473016 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 6 of A213800

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A020419 A141287 A238050 * A252309 A141039 A205731

Adjacent sequences:  A213801 A213802 A213803 * A213805 A213806 A213807

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 20 2012

STATUS

approved

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Last modified October 13 16:10 EDT 2019. Contains 327966 sequences. (Running on oeis4.)