a(n) = floor(Pi * n!).

Terms

a(0) =3a(1) =3a(2) =6a(3) =18a(4) =75a(5) =376a(6) =2261a(7) =15833a(8) =126669a(9) =1140021a(10) =11400211a(11) =125402325a(12) =1504827907a(13) =19562762799a(14) =273878679186