a(n) = ((3+2*sqrt(2))*(4+sqrt(2))^n + (3-2*sqrt(2))*(4-sqrt(2))^n)/2.
A163604
a(n) = ((3+2*sqrt(2))*(4+sqrt(2))^n + (3-2*sqrt(2))*(4-sqrt(2))^n)/2.
Terms
- a(0) =3a(1) =16a(2) =86a(3) =464a(4) =2508a(5) =13568a(6) =73432a(7) =397504a(8) =2151984a(9) =11650816a(10) =63078752a(11) =341518592a(12) =1849046208a(13) =10011109376a(14) =54202228096a(15) =293462293504
External references
- oeis: A163604