A331643 Number of binary matrices with distinct nonzero rows, a total of n ones and each column with the same number of ones.

1, 3, 13, 81, 541, 4803, 47293, 552009, 7088365, 102697083, 1622632573, 28141672449, 526858348381, 10648798871763, 230283520498573, 5317134540336849, 130370767029135901, 3385908728450965323, 92801587319328411133, 2677804893723072559401, 81124826179976677328845

Offset: 1

Author

Andrew Howroyd, Jan 24 2020

Keywords

• nonn

Examples

			The a(2) = 3 matrices are:
  [1 0]  [0 1]  [1 1]
  [0 1]  [1 0]
		

Crossrefs

Cf. A331567.

Formula

a(n) = Sum_{d|n} A331567(n/d, d).