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A199320
5*6^n+1.
2
6, 31, 181, 1081, 6481, 38881, 233281, 1399681, 8398081, 50388481, 302330881, 1813985281, 10883911681, 65303470081, 391820820481, 2350924922881, 14105549537281, 84633297223681, 507799783342081, 3046798700052481, 18280792200314881
OFFSET
0,1
FORMULA
a(n) = 6*a(n-1)-5.
a(n) = 7*a(n-1)-6*a(n-2).
G.f.: (6-11*x)/((1-x)*(1-6*x)).
PROG
(Magma) [5*6^n+1: n in [0..30]];
CROSSREFS
Sequence in context: A321799 A275403 A338674 * A097176 A361306 A368535
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 06 2011
STATUS
approved