Generalized Stirling2 array (6,2).

Terms

a(0) =1a(1) =30a(2) =12a(3) =1a(4) =2700a(5) =1920a(6) =426a(7) =36a(8) =1a(9) =491400a(10) =478800a(11) =162540a(12) =25344a(13) =1956a(14) =72a(15) =1a(16) =150368400a(17) =181440000a(18) =80451000a(19) =17624880a(20) =2130660a(21) =147840a(22) =5820a(23) =120a(24) =1a(25) =69470200800a(26) =98424849600a(27) =52905560400a(28) =14618016000a(29) =2346624000