Triangle read by rows: T(n,k) = Sum_{c in C(n,k)} lcm(c) where C(n,k) is the set of all k-subsets of {1,2,...,n}.
A181853
Triangle read by rows: T(n,k) = Sum_{c in C(n,k)} lcm(c) where C(n,k) is the set of all k-subsets of {1,2,...,n}.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =2a(6) =1a(7) =6a(8) =11a(9) =6a(10) =1a(11) =10a(12) =31a(13) =34a(14) =12a(15) =1a(16) =15a(17) =81a(18) =189a(19) =182a(20) =60a(21) =1a(22) =21a(23) =141a(24) =393a(25) =494a(26) =282a(27) =60a(28) =1a(29) =28
External references
- oeis: A181853