Triangle read by rows. Polynomials based on sums of Moebius transforms.

Terms

a(0) =1a(1) =1a(2) =0a(3) =1a(4) =3a(5) =-2a(6) =1a(7) =6a(8) =5a(9) =-6a(10) =1a(11) =10a(12) =35a(13) =26a(14) =-48a(15) =1a(16) =15a(17) =85a(18) =165a(19) =-26a(20) =-120a(21) =1a(22) =21a(23) =175a(24) =735a(25) =1264a(26) =-36a(27) =-1440a(28) =1a(29) =28