Triangle of generalized Stirling numbers S_{3,2}(n,k) read by rows (n>=1, 2<=k<=2n).

Terms

a(0) =1a(1) =6a(2) =6a(3) =1a(4) =72a(5) =168a(6) =96a(7) =18a(8) =1a(9) =1440a(10) =5760a(11) =6120a(12) =2520a(13) =456a(14) =36a(15) =1a(16) =43200a(17) =259200a(18) =424800a(19) =285120a(20) =92520a(21) =15600a(22) =1380a(23) =60a(24) =1a(25) =1814400a(26) =15120000a(27) =34776000a(28) =33566400a(29) =16304400