OFFSET
0,1
LINKS
Index entries for linear recurrences with constant coefficients, signature (12, -47, 60).
FORMULA
a(n)=Sum(i!i^2 Stirling2[n, i-2](-1)^(n+2-i), i=2, .., n + 2)
MATHEMATICA
Table[2*3^n - 18*4^n + 24*5^n, {n, 0, 25}]
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Mario Catalani (mario.catalani(AT)unito.it), Jan 08 2004
STATUS
approved