login
A199556
9*8^n+1.
1
10, 73, 577, 4609, 36865, 294913, 2359297, 18874369, 150994945, 1207959553, 9663676417, 77309411329, 618475290625, 4947802324993, 39582418599937, 316659348799489, 2533274790395905, 20266198323167233, 162129586585337857
OFFSET
0,1
FORMULA
a(n) = 8*a(n-1)-7.
a(n) = 9*a(n-1)-8*a(n-2).
G.f.: (10-17*x)/((1-x)*(1-8*x)).
PROG
(Magma) [9*8^n+1: n in [0..30]];
CROSSREFS
Sequence in context: A181678 A206817 A159687 * A044197 A044578 A309884
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 08 2011
STATUS
approved