a(n) = ((3+sqrt(3))*(5+sqrt(3))^n + (3-sqrt(3))*(5-sqrt(3))^n)/6.
A162558
a(n) = ((3+sqrt(3))*(5+sqrt(3))^n + (3-sqrt(3))*(5-sqrt(3))^n)/6.
Terms
- a(0) =1a(1) =6a(2) =38a(3) =248a(4) =1644a(5) =10984a(6) =73672a(7) =495072a(8) =3329936a(9) =22407776a(10) =150819168a(11) =1015220608a(12) =6834184384a(13) =46006990464a(14) =309717848192
External references
- oeis: A162558