a(n) = Pell(n) * Pell(n-1) * Pell(n-2) * Pell(n-3) / 120.

A099931

a(n) = Pell(n) * Pell(n-1) * Pell(n-2) * Pell(n-3) / 120.

Terms

    a(0) =1a(1) =29a(2) =1015a(3) =34307a(4) =1166438a(5) =39618670a(6) =1345902818a(7) =45720876202

External references