A398100 - OEIS

A398100

Number of inequivalent n X n symmetric nonnegative integer matrices with each row sum nonzero and at most n, up to simultaneous row and column permutations.

1, 1, 7, 64, 1442, 83174, 14985294, 8873936336, 17617183425285, 118615229064110868, 2743170630241401047340, 220645974871847004591682814, 62427422699235388923425163841204, 62745900833935204360987697359572554084

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OFFSET

0,3

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Main diagonal of A398099.

Cf. A397931, A398075.

Sequence in context: A252654 A352841 A197787 * A024095 A274823 A174508

Adjacent sequences: A398097 A398098 A398099 * A398101 A398102 A398103

KEYWORD

nonn

AUTHOR

Andrew Howroyd, Aug 16 2026

STATUS

approved