A133680 a(n)=8*a(n-1)+72*a(n-2) for n>=3, a(0)=1, a(1)=8, a(2)=128 .
1, 8, 128, 1600, 22016, 291328, 3915776, 52301824, 700350464, 9368535040, 125373513728, 1677522632704, 22447074050048, 300358221955072, 4019055107244032, 53778232838717440, 719597830431309824
Offset: 0
Links
- Harvey P. Dale, Table of n, a(n) for n = 0..887
- Index entries for linear recurrences with constant coefficients, signature (8,72).
Programs
-
Mathematica
LinearRecurrence[{8,72},{1,8,128},20] (* Harvey P. Dale, Sep 15 2015 *)
Formula
G.f.: (1-8*x^2)/(1-8*x-72*x^2) . a(n) = Sum_{k, 0<=k<=n}A122950(n,k)*8^k .