OFFSET
0,2
FORMULA
From Amiram Eldar, Apr 03 2021: (Start)
Sum_{n>=0} 1/a(n) = A195070.
Sum_{n>=0} (-1)^n/a(n) = A196498. (End)
MATHEMATICA
a[n_] := (10*n)!; Array[a, 6, 0] (* Amiram Eldar, Apr 03 2021 *)
PROG
(Magma) [Factorial(10*n): n in [0..10]]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Sep 24 2011
STATUS
approved