a(n) is the product of the first n odd numbers not divisible by 5.

A358990

a(n) is the product of the first n odd numbers not divisible by 5.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =21a(4) =189a(5) =2079a(6) =27027a(7) =459459a(8) =8729721a(9) =183324141a(10) =4216455243a(11) =113844291561

External references