Number of nonnegative integer matrices of order n for which all row and column sums equal n.
A110058
Number of nonnegative integer matrices of order n for which all row and column sums equal n.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =55a(4) =10147a(5) =22069251a(6) =602351808741
External references
- oeis: A110058