a(n) = (2nd elementary symmetric function of {1/1, 1/2, ..., 1/n})*(lcm(S))^2, where S = {1,2,...,n}.
A025531
a(n) = (2nd elementary symmetric function of {1/1, 1/2, ..., 1/n})*(lcm(S))^2, where S = {1,2,...,n}.
Terms
- a(0) =2a(1) =36a(2) =210a(3) =6750a(4) =8120a(5) =459620a(6) =2067170a(7) =20522250a(8) =22318758a(9) =2905171038a(10) =3098543448a(11) =554652370272a(12) =584150230092a(13) =612299943684
External references
- oeis: A025531