A000516 Number of equivalence classes of n X n matrices over {0,1} with rows and columns summing to 5, where equivalence is defined by row and column permutations. Isomorphism classes of bicolored 5-regular bipartite graphs, where isomorphism cannot exchange the colors.

0, 0, 0, 0, 1, 1, 4, 51, 3529, 601055, 156473848, 54062069505, 23869437984682, 13186966476208771, 8971034249976338907, 7414924597575224629299, 7360058177440420943520750, 8683626883245180573511018830, 12066478410398147578519948851818, 19585444567548740264243478805318202

Offset

1,7

Links

Table of n, a(n) for n=1..20.

Index entries for sequences related to Latin squares and rectangles

Crossrefs

Column k=5 of A133687.

Cf. A000512, A000513.

Sequence in context: A210834 A287231 A289708 * A182044 A000854 A377382

Adjacent sequences: A000513 A000514 A000515 * A000517 A000518 A000519

Keyword

nonn

Author

Eric Rogoyski

Extensions

Definition corrected by Brendan McKay, May 28 2006

Offset corrected and terms a(12) and beyond from Andrew Howroyd, Apr 01 2020

Status

approved