A091433 a(n)=2*3^n - 18*4^n + 24*5^n.

8, 54, 330, 1902, 10554, 57054, 302730, 1584462, 8208474, 42195774, 215618730, 1096731822, 5558447994, 28092104094, 141662102730, 713123219982, 3584886057114, 18001567510014, 90316558634730, 452818194072942

Offset

0,1

Links

Table of n, a(n) for n=0..19.

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

Sequence in context: A152692 A351845 A037966 * A081899 A057970 A208310

Adjacent sequences: A091430 A091431 A091432 * A091434 A091435 A091436

Keyword

easy,nonn

Author

Mario Catalani (mario.catalani(AT)unito.it), Jan 08 2004

Status

approved