Part of n! composed of prime factors of form 4k+3.

Terms

a(0) =1a(1) =1a(2) =3a(3) =3a(4) =3a(5) =9a(6) =63a(7) =63a(8) =567a(9) =567a(10) =6237a(11) =18711a(12) =18711a(13) =130977a(14) =392931a(15) =392931a(16) =392931a(17) =3536379a(18) =67191201a(19) =67191201a(20) =1411015221a(21) =15521167431a(22) =356986850913