a(n) = ( Product {k = 1..n} 3*k - 1 ) * ( Sum {k = 1..n} (-1)^(k+1)/(3*k - 1) ).
A024396
a(n) = ( Product {k = 1..n} 3*k - 1 ) * ( Sum {k = 1..n} (-1)^(k+1)/(3*k - 1) ).
Terms
- a(0) =1a(1) =3a(2) =34a(3) =294a(4) =4996a(5) =72612a(6) =1661680a(7) =34029840a(8) =981118240a(9) =25947526560a(10) =902963019520
External references
- oeis: A024396