28367

Appears in sequences

• Triangle T(n,k) giving number of loopless matroids of rank k on n labeled points (n >= 0, 0 <= k <= n).at n=32A058710
• Triangle T(n,k) giving the number of loopless matroids of rank k on n labeled points (n >= 1, 1 <= k <= n).at n=24A058711
• Number of disjoint covering systems of cardinality n, up to equivalence under shift.at n=11A294672
• Numbers k such that the coefficient of x^k in the expansion of Product_{m >= 1} (1-x^m)^15 is zero.at n=11A322043
• Numbers k such that k and k+2 are both A000120-perfect numbers (A175522).at n=34A360639