Triangle T(n,r) = LCM(n,n-1,n-2,...,n-r+1)/LCM(1,2,3,...,r-1,r), 0 <= r < n.
1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 1, 4, 6, 2, 1, 1, 5, 10, 10, 5, 1, 1, 6, 15, 10, 5, 1, 1, 1, 7, 21
1 seqfan posts
Sun Dec 28 18:50:04 CET 2008 [seqfan] An interesting coincidence