69272domain: NAppears in sequencesa(n) = n! * Sum_{k=1..n-2} 1/k!.at n=8A038157Multiply by 1, add 1, multiply by 2, add 2, etc.at n=15A082459Number of distinct (unordered) pairs of partitions of an 8-element set that have Rand distance n.at n=2A192098