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)=2, k=1 and l=-1.

A176828

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)=2, k=1 and l=-1.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =16a(4) =55a(5) =203a(6) =791a(7) =3206a(8) =13373a(9) =57009a(10) =247221a(11) =1087029a(12) =4834785a(13) =21712543a(14) =98317921a(15) =448393292a(16) =2057777663a(17) =9495751679a(18) =44033646503a(19) =205087784247a(20) =958968100635

External references