

A247596


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


6



1, 5, 35, 410, 6178, 122038, 2921607, 81609320, 2588949454, 91699869557, 3582942335285, 153048366545566, 7096576775166579, 355120233277118103, 19084972486216897560, 1096965038775477639368, 67192642484367187943761, 4372413334294007638726854
(list;
graph;
refs;
listen;
history;
text;
internal format)



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



