2126495

Appears in sequences

• a(n) = floor((1/n)*(S(n,1) + S(n,2) + ... + S(n,n))), where S(i,j) are Stirling numbers of second kind.at n=12A024426
• a(n) = (b(p)-2)/p where b(k) denotes Bell numbers and p = prime(n).at n=5A079609
• Number of n-bead necklace structures using an infinite alphabet that are not self-equivalent under a nonzero rotation.at n=13A327696