OFFSET
0,3
COMMENTS
The sequence is related to the fake even and fake odd sequences and also the factorial and double factorial sequences, so seems in the short run linear but in the long run exponential.
FORMULA
a(a(n)) = (n!)!
EXAMPLE
a(6) = 720 because (3!)! = 6! = 720
CROSSREFS
KEYWORD
easy,nonn,obsc
AUTHOR
Michael Joseph Halm, Feb 12 2005
EXTENSIONS
The definition does not match the data. How was this sequence generated? - N. J. A. Sloane, Feb 21 2021
STATUS
approved