Triangle read by rows: Riordan array (2 - D(x), x * D(x)) where D(x) is g.f. of A001764.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-3a(4) =0a(5) =1a(6) =-12a(7) =-1a(8) =1a(9) =1a(10) =-55a(11) =-6a(12) =2a(13) =2a(14) =1a(15) =-273a(16) =-33a(17) =5a(18) =6a(19) =3a(20) =1a(21) =-1428a(22) =-182a(23) =13a(24) =22a(25) =11a(26) =4a(27) =1a(28) =-7752a(29) =-1020