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A361153
a(0)=0, a(1)=1; thereafter a(n) = (n-1)*a(n-1)! + (n-2)*a(n-2)!.
0
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.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Mar 03 2023, following a suggestion from Akshat Kadia, Feb 2023
STATUS
approved