A361153 a(0)=0, a(1)=1; thereafter a(n) = (n-1)*a(n-1)! + (n-2)*a(n-2)!.

0, 1, 1, 3, 20, 9731608032706560018

Offset

0,4

Comments

The next term is too large to include.

There is a suggestion that this is mentioned in Kenneth H. Rosen's book "Discrete Mathematics and Its Applications". It would be nice to have a precise reference, including edition, date, and page number.

Links

Table of n, a(n) for n=0..5.

Crossrefs

Cf. A000045, A005604, A114045.

Sequence in context: A203314 A174652 A024011 * A229197 A188721 A371102

Adjacent sequences: A361150 A361151 A361152 * A361154 A361155 A361156

Keyword

nonn

Author

N. J. A. Sloane, Mar 03 2023, following a suggestion from Akshat Kadia, Feb 2023

Status

approved