1084948961domain: NAppears in sequencesa(n) = (1/5040)*7^n + (1/240)*5^n + (1/72)*4^n + (1/16)*3^n + (11/60)*2^n + 53/144. Partial sum of Stirling numbers of second kind S(n,i), i=1..7 (i.e., a(n) = Sum_{i=1..7} S(n,i)).at n=14A099262Number of ways to partition a set of n elements into at most n/2 disjoint subsets.at n=15A277364