A328889 Number of acyclic edge covers of the complete bipartite graph K_{n,n}.

1, 6, 132, 6728, 632970, 96208632, 21634786586, 6765592120576, 2811089200308642, 1498814096387846600, 997811910708863804202, 811362765374061475234464, 791392079095826028308709026, 912043721764132114072259699656, 1226095938791120621169019081161450

Offset: 1

Author

Andrew Howroyd, Oct 29 2019

Keywords

• nonn

Links

• Andrew Howroyd, Table of n, a(n) for n = 1..100
• Eric Weisstein's World of Mathematics, Complete Bipartite Graph

Crossrefs

Main diagonal of A328888.

Cf. A068087 (spanning trees).

Cf. A297077 (not necessarily covering edge sets).