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A199553
5*8^n+1.
1
6, 41, 321, 2561, 20481, 163841, 1310721, 10485761, 83886081, 671088641, 5368709121, 42949672961, 343597383681, 2748779069441, 21990232555521, 175921860444161, 1407374883553281, 11258999068426241, 90071992547409921
OFFSET
0,1
FORMULA
a(n) = 8*a(n-1)-7.
a(n) = 9*a(n-1)-8*a(n-2).
G.f.: (6-13*x)/((1-x)*(1-8*x)).
PROG
(Magma) [5*8^n+1: n in [0..30]];
CROSSREFS
Sequence in context: A366837 A024078 A095177 * A225031 A307663 A345189
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 08 2011
STATUS
approved