A199555 7*8^n+1.
8, 57, 449, 3585, 28673, 229377, 1835009, 14680065, 117440513, 939524097, 7516192769, 60129542145, 481036337153, 3848290697217, 30786325577729, 246290604621825, 1970324836974593, 15762598695796737, 126100789566373889
Offset: 0
Links
- Vincenzo Librandi, Table of n, a(n) for n = 0..1000
- Index entries for linear recurrences with constant coefficients, signature (9,-8).
Programs
-
Magma
[7*8^n+1: n in [0..30]];
Formula
a(n) = 8*a(n-1)-7.
a(n) = 9*a(n-1)-8*a(n-2).
G.f.: (8-15*x)/((1-x)*(1-8*x)).