Row sums of the inverse of number triangle A(n,k) = 1/C(n) if k <= n <= 2k, 0 otherwise, where C(n) = A000108(n).

A127768

Row sums of the inverse of number triangle A(n,k) = 1/C(n) if k <= n <= 2k, 0 otherwise, where C(n) = A000108(n).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =4a(4) =9a(5) =29a(6) =90a(7) =301a(8) =1001a(9) =3441a(10) =11934a(11) =42019a(12) =149226a(13) =534978a(14) =1931540a(15) =7020706a(16) =25662825a(17) =94288121a(18) =347993910a(19) =1289627931a(20) =4796857230a(21) =17902158534a(22) =67016296620a(23) =251577092029a(24) =946844533674

External references