a(n) = (n!/(n+1))*Sum_{k=0..n} binomial(n+k-1,k)/k!.
A111140
a(n) = (n!/(n+1))*Sum_{k=0..n} binomial(n+k-1,k)/k!.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =13a(4) =71a(5) =466a(6) =3582a(7) =31641a(8) =316171a(9) =3526606a(10) =43421978a(11) =584716386a(12) =8544649478a(13) =134622445348
External references
- oeis: A111140