A165437 The number of six-fold coverings of a set.

1, 1, 7, 256, 52450, 46757209, 135029200594, 992649275638900, 15637211080656145509, 468371757818481922636261, 24491541042280069722306974244, 2097907014780540445950132842480077, 280173584370772226399860619059838944713, 56066456120812871209756615894736908159099853

Offset

0,3

Comments

Analogous to A165434. See comments and references there.

Links

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

Crossrefs

Row n=6 of A188392.

Cf. A165434.

Sequence in context: A228291 A119942 A188421 * A232304 A254127 A203968

Adjacent sequences: A165434 A165435 A165436 * A165438 A165439 A165440

Keyword

nonn

Author

Doron Zeilberger, Sep 18 2009

Extensions

a(11)-a(13) from Andrew Howroyd, Dec 10 2018

Status

approved