OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
FORMULA
a(n) = 5*A000142(n)-1.
a(0)=4, a(n) = n*a(n-1)+n-1. - Vincenzo Librandi, Sep 30 2013
MATHEMATICA
Table[5 n! - 1, {n, 0, 25}] (* Vincenzo Librandi, Sep 30 2013 *)
PROG
(Magma) [5*Factorial(n)-1: n in [0..25]]; // Vincenzo Librandi, Sep 30 2013
(Magma) [4] cat [n eq 1 select n+3 else n*Self(n-1)+n-1: n in [1..25] ]; // Vincenzo Librandi, Sep 30 2013
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Feb 16 2010
EXTENSIONS
a(16) corrected from Vincenzo Librandi, Sep 30 2013
STATUS
approved