Indices of centered hexagonal numbers (A003215) that are also heptagonal numbers (A000566).
A254965
Indices of centered hexagonal numbers (A003215) that are also heptagonal numbers (A000566).
Terms
- a(0) =1a(1) =2a(2) =13a(3) =34a(4) =275a(5) =736a(6) =6027a(7) =16148a(8) =132309a(9) =354510a(10) =2904761a(11) =7783062a(12) =63772423a(13) =170872844a(14) =1400088535a(15) =3751419496a(16) =30738175337a(17) =82360356058a(18) =674839768869
External references
- oeis: A254965