A247596 Number of nonisomorphic binary n X n matrices with three 1's per column under row and column permutations.

1, 5, 35, 410, 6178, 122038, 2921607, 81609320, 2588949454, 91699869557, 3582942335285, 153048366545566, 7096576775166579, 355120233277118103, 19084972486216897560, 1096965038775477639368, 67192642484367187943761, 4372413334294007638726854

Offset

3,2

Links

Andrew Howroyd, Table of n, a(n) for n = 3..40

StackExchange, How many arrays with crossed cells, order of rows/columns irrelevant, Dec 13 2013

Maple

seq(matrix_marks(n, 3), n=3..15); # Using the uploaded program to A247417

Prog

(PARI) \\ See A304942 for Blocks
a(n) = Blocks(n, n, 3); \\ Andrew Howroyd, May 23 2018

Crossrefs

Column k=3 of A304942.

A diagonal of A305027.

Cf. A247417, A247597, A247598.

Sequence in context: A210996 A204290 A059865 * A325408 A097492 A125802

Adjacent sequences: A247593 A247594 A247595 * A247597 A247598 A247599

Keyword

nonn

Author

Marko Riedel, Sep 21 2014

Extensions

Terms a(17) and beyond from Andrew Howroyd, May 23 2018

Status

approved