Hankel transform of number of divisors sequence (A000005).

Terms

a(0) =1a(1) =-2a(2) =3a(3) =3a(4) =-7a(5) =-3a(6) =16a(7) =3a(8) =-27a(9) =-27a(10) =51a(11) =-131a(12) =-198a(13) =153a(14) =680a(15) =87a(16) =-144a(17) =1728a(18) =837a(19) =-612a(20) =-1209a(21) =8323a(22) =7692a(23) =-18603a(24) =19731a(25) =90355a(26) =53811a(27) =-11862a(28) =-26325a(29) =-4617