a(n) = 20*a(n-1) + a(n-2), starting with a(0) = 2 and a(1) = 20.
A090309
a(n) = 20*a(n-1) + a(n-2), starting with a(0) = 2 and a(1) = 20.
Terms
- a(0) =2a(1) =20a(2) =402a(3) =8060a(4) =161602a(5) =3240100a(6) =64963602a(7) =1302512140a(8) =26115206402a(9) =523606640180
External references
- oeis: A090309