Indices of centered octagonal numbers (A016754) that are also pentagonal numbers (A000326).
A248205
Indices of centered octagonal numbers (A016754) that are also pentagonal numbers (A000326).
Terms
- a(0) =1a(1) =50a(2) =4851a(3) =475300a(4) =46574501a(5) =4563825750a(6) =447208348951
External references
- oeis: A248205