a(n) = (19/28)*(3^n-1)*P(n-1)+(3/7)*(4*3^n-5)*P(n) where P() are the Pell numbers A000129.
A187919
a(n) = (19/28)*(3^n-1)*P(n-1)+(3/7)*(4*3^n-5)*P(n) where P() are the Pell numbers A000129.
Terms
- a(0) =3a(1) =32a(2) =256a(3) =1912a(4) =13989a(5) =101656a(6) =737078a(7) =5340368a(8) =38683143a(9) =280179632a(10) =2029268236a(11) =14697327880a(12) =106447627113a(13) =770962306792
External references
- oeis: A187919