Sequence defined by the recurrence formula a(n+1)=sum(a(p)*a(n-p)+k,p=0..n)+l for n>=1, with here a(0)=1, a(1)=4, k=-2 and l=0.

A177117

Sequence defined by the recurrence formula a(n+1)=sum(a(p)*a(n-p)+k,p=0..n)+l for n>=1, with here a(0)=1, a(1)=4, k=-2 and l=0.

Terms

    a(0) =1a(1) =4a(2) =4a(3) =18a(4) =60a(5) =270a(6) =1152a(7) =5254a(8) =24028a(9) =112606a(10) =533320a(11) =2559974a(12) =12404900a(13) =60657566a(14) =298826672a(15) =1482082774a(16) =7393735948a(17) =37078771678a(18) =186813107800a(19) =945165976262

External references