Triangle read by rows, Lah numbers with level 2.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =4a(5) =1a(6) =0a(7) =36a(8) =20a(9) =1a(10) =0a(11) =576a(12) =536a(13) =56a(14) =1a(15) =0a(16) =14400a(17) =19872a(18) =3280a(19) =120a(20) =1a(21) =0a(22) =518400a(23) =988128a(24) =229792a(25) =13000a(26) =220a(27) =1a(28) =0a(29) =25401600