a(n) = 6*a(n-1) - a(n-2) for n > 1, a(0)=0 and a(1)=2.
A001542
a(n) = 6*a(n-1) - a(n-2) for n > 1, a(0)=0 and a(1)=2.
Terms
- a(0) =0a(1) =2a(2) =12a(3) =70a(4) =408a(5) =2378a(6) =13860a(7) =80782a(8) =470832a(9) =2744210a(10) =15994428a(11) =93222358a(12) =543339720a(13) =3166815962a(14) =18457556052a(15) =107578520350a(16) =627013566048
External references
- oeis: A001542