

A260340


Triangle read by rows: T(n,k) = number of sets of linear nads in k variables.


6



1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 6, 1, 1, 1, 1, 22, 22, 1, 1, 1, 1, 130, 550, 130, 1, 1, 1, 1, 822, 16700, 16700, 822, 1, 1, 1, 1, 6202, 703297, 3330915, 703297, 6202, 1, 1, 1, 1, 52552, 38135272, 957659906, 957659906, 38135272, 52552, 1, 1
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OFFSET

0,13


COMMENTS

T(n,k) is the number of nonequivalent n X n binary matrices with k ones in every row and column up to permutation of rows.  Andrew Howroyd, Apr 18 2020


LINKS



FORMULA



EXAMPLE

Triangle begins:
1;
1, 1;
1, 1, 1;
1, 1, 1, 1;
1, 1, 6, 1, 1;
1, 1, 22, 22, 1, 1;
1, 1, 130, 550, 130, 1, 1;
1, 1, 822, 16700, 16700, 822, 1, 1;
1, 1, 6202, 703297, 3330915, 703297, 6202, 1, 1;
...


CROSSREFS



KEYWORD



AUTHOR



EXTENSIONS

Extended to include k=0 and more terms added by Andrew Howroyd, Apr 18 2020


STATUS

approved



