a(n+1) = 1 + Sum_{p=0..n} a(p)*a(n-p)+k for n>=1, with here a(0)=1, a(1)=2, k=-1 and l=-1.
A176954
a(n+1) = 1 + Sum_{p=0..n} a(p)*a(n-p)+k for n>=1, with here a(0)=1, a(1)=2, k=-1 and l=-1.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =2a(4) =3a(5) =9a(6) =27a(7) =92a(8) =313a(9) =1083a(10) =3753a(11) =13063a(12) =45581a(13) =159501a(14) =559549a(15) =1967878a(16) =6937267a(17) =24511653a(18) =86797683a(19) =308003549a(20) =1095155727a(21) =3901490015a(22) =13924590847a(23) =49784694997a(24) =178293760747a(25) =639543538859
External references
- oeis: A176954