2nd order recursive series having the property that the product of any two adjacent terms is a triangular number, T(b) = b(b+1)/2 where b equals term a(n) of related series A108262.
A108261
2nd order recursive series having the property that the product of any two adjacent terms is a triangular number, T(b) = b(b+1)/2 where b equals term a(n) of related series A108262.
Terms
- a(0) =2a(1) =3a(2) =12a(3) =65a(4) =374a(5) =2175a(6) =12672a(7) =73853a(8) =430442a(9) =2508795a(10) =14622324a(11) =85225145a(12) =496728542a(13) =2895146103a(14) =16874148072a(15) =98349742325a(16) =573224305874
External references
- oeis: A108261