a(n) = floor(n*(2+sqrt(5))^n), equivalently, floor(n*phi^(3n)), where phi = (1+sqrt(5))/2 is the golden ratio.
A354855
a(n) = floor(n*(2+sqrt(5))^n), equivalently, floor(n*phi^(3n)), where phi = (1+sqrt(5))/2 is the golden ratio.
Terms
- a(0) =0a(1) =4a(2) =35a(3) =228a(4) =1287a(5) =6820a(6) =34667a(7) =171332a(8) =829455a(9) =3952836a(10) =18604979a(11) =86693156a(12) =400623383a(13) =1838490212a(14) =8387044091a(15) =38065809540a(16) =171999313951a(17) =774138335108
External references
- oeis: A354855