A165435 Number of quad-coverings of a set.

1, 1, 5, 81, 4079, 507549, 127126912, 55643064708, 38715666455777, 40095856807088486, 58901884724160709571, 118283825763578012358080, 315297447553856723754810322, 1089117884184737631305395668913, 4778248300569771278502378511288513

Offset

0,3

Comments

Analogous to A165434. See comments and references there.

Links

Table of n, a(n) for n=0..14.

Crossrefs

Row 4 of A188392.

Cf. A165434.

Sequence in context: A336807 A188419 A009634 * A197443 A337852 A280220

Adjacent sequences: A165432 A165433 A165434 * A165436 A165437 A165438

Keyword

nonn

Author

Doron Zeilberger, Sep 18 2009

Status

approved