Triangle read by rows, (2, 2)-Lah numbers.

Terms

a(0) =1a(1) =16a(2) =1a(3) =400a(4) =52a(5) =1a(6) =14400a(7) =2948a(8) =116a(9) =1a(10) =705600a(11) =203072a(12) =12344a(13) =216a(14) =1a(15) =45158400a(16) =17154432a(17) =1437472a(18) =38480a(19) =360a(20) =1a(21) =3657830400a(22) =1760601600a(23) =191088544a(24) =6978592a(25) =99320a(26) =556a(27) =1a(28) =365783040000a(29) =216690624000