2027026

Appears in sequences

• Number of permutations in the symmetric group S_n such that the size of their conjugacy class is odd.at n=15A088042
• Triangle read by rows: T(n,0)=1, T(n,n)=(2*n-1)!!+1, T(n,k) = 2*(n-k) * T(n-1,k-1) + 2*(k+1)*T(n-1,k).at n=44A099755
• Triangle t(n,m)=A039757(n,m)+A039757(n,n-m) read by rows.at n=36A155719