Number of nonnegative integer square matrices with sum of entries equal to n, no zero rows or columns, and the same row sums as column sums.
A321732
Number of nonnegative integer square matrices with sum of entries equal to n, no zero rows or columns, and the same row sums as column sums.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =11a(4) =53a(5) =317a(6) =2293a(7) =19435a(8) =188851a(9) =2068417a(10) =25203807a(11) =338117445a(12) =4951449055a(13) =78589443061
External references
- oeis: A321732