A199320 5*6^n+1.
6, 31, 181, 1081, 6481, 38881, 233281, 1399681, 8398081, 50388481, 302330881, 1813985281, 10883911681, 65303470081, 391820820481, 2350924922881, 14105549537281, 84633297223681, 507799783342081, 3046798700052481, 18280792200314881
Offset: 0
Links
- Vincenzo Librandi, Table of n, a(n) for n = 0..1000
- Index entries for linear recurrences with constant coefficients, signature (7,-6).
Programs
-
Magma
[5*6^n+1: n in [0..30]];
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)).