Product of positive odd integers smaller than n and relatively prime to n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =3a(5) =5a(6) =15a(7) =105a(8) =35a(9) =189a(10) =945a(11) =385a(12) =10395a(13) =19305a(14) =1001a(15) =2027025a(16) =2027025a(17) =85085a(18) =34459425a(19) =8729721a(20) =230945a(21) =1249937325a(22) =13749310575a(23) =37182145a(24) =4216455243a(25) =608142583125a(26) =929553625a(29) =215656441