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A333734
Number of nonisomorphic n X n nonnegative integer matrices with all row and column sums equal to n up to permutations of rows and columns.
1
1, 1, 2, 5, 43, 1856, 1217727, 8597641912, 646296747486387, 535435113671568180963, 5081029530811947425598907884
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..10.
EXAMPLE
The a(2) = 2 matrices are:
[1 1] [2 0]
[1 1] [0 2]
.
The a(3) = 5 matrices are:
[1 1 1] [2 1 0] [2 1 0] [3 0 0] [3 0 0]
[1 1 1] [1 1 1] [0 2 1] [0 2 1] [0 3 0]
[1 1 1] [0 1 2] [1 0 2] [0 1 2] [0 0 3]
CROSSREFS
Main diagonal of
A333733
.
Cf.
A110058
.
Sequence in context:
A286871
A027730
A225724
*
A163115
A221682
A366406
Adjacent sequences:
A333731
A333732
A333733
*
A333735
A333736
A333737
KEYWORD
nonn
,
more
AUTHOR
Andrew Howroyd
, Apr 04 2020
STATUS
approved
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Last modified February 29 21:35 EST 2024. Contains 370428 sequences. (Running on oeis4.)