2390480

Appears in sequences

• Number of self-inverse permutations on n letters, also known as involutions; number of standard Young tableaux with n cells.at n=14A000085
• Bisection of A000085.at n=7A066223
• Number of permutations in the symmetric group S_n such that the size of their conjugacy class is odd.at n=13A088042
• Triangle read by rows: Number of D-classes in Partial Brauer Monoid PB_n.at n=35A276772
• Number T(n,k) of partitions of [n] having exactly k blocks of size at least three; triangle T(n,k), n>=0, 0<=k<=floor(n/3), read by rows.at n=40A355144
• Number of permutations of [n] whose compositional square is the identity permutation or its reverse.at n=14A383835