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)=1, k=0 and l=-1.

A176677

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)=1, k=0 and l=-1.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =14a(6) =41a(7) =123a(8) =375a(9) =1158a(10) =3615a(11) =11393a(12) =36209a(13) =115940a(14) =373709a(15) =1211740a(16) =3949969a(17) =12937612a(18) =42558745a(19) =140547051a(20) =465799527a(21) =1548766044a(22) =5164917003a(23) =17271369744a(24) =57900615135a(25) =194558333460a(26) =655168354935

External references