A199416 2*7^n+1.
3, 15, 99, 687, 4803, 33615, 235299, 1647087, 11529603, 80707215, 564950499, 3954653487, 27682574403, 193778020815, 1356446145699, 9495123019887, 66465861139203, 465261027974415, 3256827195820899, 22797790370746287
Offset: 0
Links
- Vincenzo Librandi, Table of n, a(n) for n = 0..1000
- Index entries for linear recurrences with constant coefficients, signature (8,-7).
Programs
-
Magma
[2*7^n+1: n in [0..30]];