a(n) = Sum_{1<=i<j<k<=n} P(i)*P(j)*P(k), where P(m) is the k-th Pell number A000129(m).
A213788
a(n) = Sum_{1<=i<j<k<=n} P(i)*P(j)*P(k), where P(m) is the k-th Pell number A000129(m).
Terms
- a(0) =0a(1) =0a(2) =0a(3) =10a(4) =214a(5) =3491a(6) =52001a(7) =748788a(8) =10636260a(9) =150248190a(10) =2117562834a(11) =29816257390a(12) =419662506490
External references
- oeis: A213788