Number of nonequivalent n-column nonnegative integer matrices with column sums 4 and any number of nonzero rows up to permutation of rows and columns.
A331721
Number of nonequivalent n-column nonnegative integer matrices with column sums 4 and any number of nonzero rows up to permutation of rows and columns.
Terms
- a(0) =1a(1) =5a(2) =66a(3) =1338a(4) =43686a(5) =2142277a(6) =149056260a(7) =13991691663
External references
- oeis: A331721