215664

Appears in sequences

• a(n) = number of subsets S of {1,2,...,n} having more than 2 elements such that (sum of least three elements of S) < max(S).at n=18A357285
• T(n,k) is the number of distinct n X n {0,1}-matrices that reach a fixed point after k alternately applied sorts by rows and columns, where T(n,k), k>=0 is an irregular triangle read by rows.at n=30A374525