A067220 Number of n X n 0..12 matrices with all row and column sums equal.

1, 13, 169, 112489, 10309971465, 121778484808846083, 193842679171307621077398205

Offset

0,2

Links

Table of n, a(n) for n=0..6.

Crossrefs

Column k=12 of A202784.

Sequence in context: A020533 A176596 A176023 * A057684 A053153 A167254

Adjacent sequences: A067217 A067218 A067219 * A067221 A067222 A067223

Keyword

nonn,more

Author

R. H. Hardin, Feb 20 2002

Extensions

a(5)-a(6) from Sean A. Irvine, Dec 11 2023

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

Status

approved