A067222 Number of n X n 0..14 matrices with all row and column sums equal.
1, 15, 225, 229503, 42980713761, 1380524064964529355, 7955148565342992851131291305
Offset: 0
Crossrefs
Column k=14 of A202784.
Extensions
a(5)-a(6) from Sean A. Irvine, Dec 10 2023
a(0)=1 prepended by Andrew Howroyd, Oct 14 2024