a(n) = Sum_{i=0..n} i^2*T(i)^2, where T(i) = A000073(i) is the i-th tribonacci number.
A337286
a(n) = Sum_{i=0..n} i^2*T(i)^2, where T(i) = A000073(i) is the i-th tribonacci number.
Terms
- a(0) =0a(1) =0a(2) =4a(3) =13a(4) =77a(5) =477a(6) =2241a(7) =10522a(8) =47386a(9) =204202a(10) =860302a(11) =3546623a(12) =14357567a(13) =57286271a(14) =225714755a(15) =879795380a(16) =3397426356a(17) =13012405492a(18) =49478890936a(19) =186932228945a(20) =702169068945
External references
- oeis: A337286