Unsigned 2-Stirling numbers of the first kind.

Terms

a(0) =1a(1) =2a(2) =1a(3) =6a(4) =5a(5) =1a(6) =24a(7) =26a(8) =9a(9) =1a(10) =120a(11) =154a(12) =71a(13) =14a(14) =1a(15) =720a(16) =1044a(17) =580a(18) =155a(19) =20a(20) =1a(21) =5040a(22) =8028a(23) =5104a(24) =1665a(25) =295a(26) =27a(27) =1a(28) =40320a(29) =69264