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A067214 Number of n X n 0..6 matrices with all row and column sums equal. 2
1, 7, 49, 5215, 21841937, 3430832678207, 21070560836988719941, 5258020825380244651432771257 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..7.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Column 6 of A202784.

Sequence in context: A259990 A061585 A202782 * A069032 A345975 A271623

Adjacent sequences:  A067211 A067212 A067213 * A067215 A067216 A067217

KEYWORD

nonn,more

AUTHOR

R. H. Hardin, Feb 20 2002

EXTENSIONS

a(0)=1 prepended and a(6)-a(7) from Andrew Howroyd, May 11 2020

STATUS

approved

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Last modified July 31 02:33 EDT 2021. Contains 346367 sequences. (Running on oeis4.)