OFFSET
0,2
MATHEMATICA
a[0] = 1; a[1] = 2;
a[n_] := a[n] = n! a[n - 1]/a[n - 2];
Table[a[n], {n, 0, 22}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jul 16 2024
STATUS
approved