a(n) = (n+2)*a(n-1) + (n+1)*(A003422(n) - 4)/6 for n > 0 with a(0) = 1.
A350309
a(n) = (n+2)*a(n-1) + (n+1)*(A003422(n) - 4)/6 for n > 0 with a(0) = 1.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =35a(4) =215a(5) =1535a(6) =12455a(7) =113255a(8) =1141415a(9) =12632615a(10) =152341415a(11) =1988514215a(12) =27934434215a(13) =420236744615
External references
- oeis: A350309