

A247597


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


5



1, 7, 132, 6178, 594203, 85820809, 16341829155, 3875736708590, 1112175913348040, 378860991866916370, 151006214911844288232, 69600017255860985666964, 36729204987785981237238642, 22003003913198378660826731007, 14851323097928973689736994569534
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OFFSET

4,2


LINKS

Andrew Howroyd, Table of n, a(n) for n = 4..40
StackExchange, How many arrays with crossed cells, order of rows/columns irrelevant, Dec 13 2013


MAPLE

seq(matrix_marks(n, 4), n=3..15); # Using the uploaded program to A247417


PROG

(PARI) \\ See A304942 for Blocks
a(n) = Blocks(n, n, 4); \\ Andrew Howroyd, May 24 2018


CROSSREFS

Column k=4 of A304942.
Cf. A247417, A247596, A247598.
Sequence in context: A028420 A220257 A220321 * A305955 A051832 A103050
Adjacent sequences: A247594 A247595 A247596 * A247598 A247599 A247600


KEYWORD

nonn


AUTHOR

Marko Riedel, Sep 21 2014


EXTENSIONS

Terms a(16) and beyond from Andrew Howroyd, May 24 2018


STATUS

approved



