Triangle of coefficients p(k, x), where p(k, x) = 2*(k-1)*p(k-1, x) -x*p(k-2, x), read by rows.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =8a(6) =3a(7) =-1a(8) =48a(9) =16a(10) =-7a(11) =384a(12) =120a(13) =-59a(14) =1a(15) =3840a(16) =1152a(17) =-606a(18) =17a(19) =46080a(20) =13440a(21) =-7392a(22) =263a(23) =-1a(24) =645120a(25) =184320a(26) =-104640a(27) =4288a(28) =-31a(29) =10321920