A067213 Number of n X n 0..5 matrices with all row and column sums equal.

1, 6, 36, 2442, 4756140, 255657603186, 394912380135575238, 18212451695911558370419098, 25800579898930843398657192741983084, 1146703506910134603350506378410721970397210150

Offset

0,2

Links

Table of n, a(n) for n=0..9.

Example

Some solutions for n=3
..3..0..2....5..1..3....4..3..2....3..2..4....0..2..2....0..5..3....5..4..1
..2..0..3....1..4..4....0..4..5....5..4..0....0..2..2....3..3..2....2..3..5
..0..5..0....3..4..2....5..2..2....1..3..5....4..0..0....5..0..3....3..3..4

Crossrefs

Column 5 of A202784.

Sequence in context: A197191 A208655 A202781 * A173604 A175719 A277726

Adjacent sequences: A067210 A067211 A067212 * A067214 A067215 A067216

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

a(8)-a(9) from Sean A. Irvine, Dec 13 2023

Status

approved