A046674 a(n) = A046673(n)/2.

1, 18, 660, 42000, 4142880, 586776960, 113020427520, 28432576972800, 9056055981772800, 3562946373482496000, 1697172166720622592000, 962691052768668647424000, 641260394342965606809600000, 495681727573700350908825600000, 440084864982859007245221888000000

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Crossrefs

Cf. A000254, A049034, A046673.

Sequence in context: A049869 A041615 A041612 * A073421 A346216 A295439

Adjacent sequences: A046671 A046672 A046673 * A046675 A046676 A046677

Keyword

nonn

Author

N. J. A. Sloane

Extensions

Offset changed to 1 by Jon E. Schoenfield, Mar 08 2020

Status

approved