G.f. A(x) = Sum_{n>=0} x^n * Product_{k=0..n} ((1+x)^(n-k+1) - x^k).
A384832
G.f. A(x) = Sum_{n>=0} x^n * Product_{k=0..n} ((1+x)^(n-k+1) - x^k).
Terms
- a(0) =1a(1) =2a(2) =4a(3) =13a(4) =41a(5) =144a(6) =533a(7) =2072a(8) =8463a(9) =36142a(10) =160852a(11) =744491a(12) =3576342a(13) =17796825a(14) =91587499a(15) =486686277a(16) =2666612930a(17) =15045088274a(18) =87301643726a(19) =520416443472
External references
- oeis: A384832