A331636 Number of nonnegative integer matrices with nonzero rows, total sum n and columns with equal sums.

1, 5, 17, 109, 557, 5785, 47357, 596365, 7151841, 106763725, 1622633597, 28757539337, 526858352477, 10758375762109, 230342261913169, 5344946955452877, 130370767029201437, 3394996816992588345, 92801587319328673277, 2681375183085608280093

Offset: 1

Author

Andrew Howroyd, Jan 23 2020

Keywords

• nonn

Examples

			The a(2) = 5 matrices are:
  [1]  [1 0]  [0 1]  [2]  [1 1]
  [1]  [0 1]  [1 0]
		

Links

• Andrew Howroyd, Table of n, a(n) for n = 1..200

Crossrefs

Cf. A316674.

Formula

a(n) = Sum_{d|n} A316674(n/d, d).