a(n) = Sum_{i=0..n} i*T(i)^2, where T(i) = A000073(i) is the i-th tribonacci number.
A337283
a(n) = Sum_{i=0..n} i*T(i)^2, where T(i) = A000073(i) is the i-th tribonacci number.
Terms
- a(0) =0a(1) =0a(2) =2a(3) =5a(4) =21a(5) =101a(6) =395a(7) =1578a(8) =6186a(9) =23610a(10) =89220a(11) =333431a(12) =1234343a(13) =4536551a(14) =16567157a(15) =60172532a(16) =217524468a(17) =783111476a(18) =2809027334a(19) =10043413545a(20) =35805255545a(21) =127314522569a(22) =451629771519
External references
- oeis: A337283