Triangle read by rows, the Bell transform of (n+2)!/2 without column 0.

Terms

a(0) =1a(1) =3a(2) =1a(3) =12a(4) =9a(5) =1a(6) =60a(7) =75a(8) =18a(9) =1a(10) =360a(11) =660a(12) =255a(13) =30a(14) =1a(15) =2520a(16) =6300a(17) =3465a(18) =645a(19) =45a(20) =1a(21) =20160a(22) =65520a(23) =47880a(24) =12495a(25) =1365a(26) =63a(27) =1a(28) =181440a(29) =740880