A067212 Number of n X n 0..4 matrices with all row and column sums equal.

1, 5, 25, 1001, 790425, 11991502235, 3632894572698505, 22823286475857170293275, 3059096488092534208632573065881, 8933959513305390145234950731901862541009, 577809775169956916510410207413319463664222819419555

Offset

0,2

Links

Table of n, a(n) for n=0..10.

Example

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

Crossrefs

Column k=4 of A202784.

Sequence in context: A359232 A359235 A137114 * A061583 A278120 A039780

Adjacent sequences: A067209 A067210 A067211 * A067213 A067214 A067215

Keyword

nonn

Author

R. H. Hardin, Feb 20 2002

Extensions

Added one term and example - R. H. Hardin, Jan 05 2012

a(7)-a(8) from Andrew Howroyd, Jun 01 2017

a(9)-a(10) from Sean A. Irvine, Dec 14 2023

a(0)=1 prepended by Andrew Howroyd, Oct 14 2024

Status

approved