login
A074544
a(n) = 2^n + 7^n + 8^n.
1
3, 17, 117, 863, 6513, 49607, 379857, 2920823, 22542273, 174571847, 1356218097, 10567263383, 82560768033, 646644832487, 5076269600337, 39931933631543, 314707907345793, 2484430327803527, 19642812107654577, 155514083261753303
OFFSET
0,1
FORMULA
From Mohammad K. Azarian, Dec 28 2008: (Start)
G.f.: 1/(1-2*x) + 1/(1-7*x) + 1/(1-8*x).
E.g.f.: exp(2*x) + exp(7*x) + exp(8*x). (End)
a(n) = 17*a(n-1) - 86*a(n-2) + 112*a(n-3).
MATHEMATICA
Table[2^n + 7^n + 8^n, {n, 0, 20}]
PROG
(Magma) [ 2^n + 7^n + 8^n: n in [0..30]]; // Vincenzo Librandi, Jun 13 2011
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Robert G. Wilson v, Aug 23 2002
STATUS
approved