Stirling numbers of the second kind, S(n,5).

Terms

a(0) =1a(1) =15a(2) =140a(3) =1050a(4) =6951a(5) =42525a(6) =246730a(7) =1379400a(8) =7508501a(9) =40075035a(10) =210766920a(11) =1096190550a(12) =5652751651a(13) =28958095545a(14) =147589284710a(15) =749206090500