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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
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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:
A204290
A059865
A376322
*
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
