a(1) = a(2) = 1; for n >= 2, a(n) is the product of number k <= n such that GCQ_A(n, k) >= 2 (see definition in comments).

A196442

a(1) = a(2) = 1; for n >= 2, a(n) is the product of number k <= n such that GCQ_A(n, k) >= 2 (see definition in comments).

Terms

    a(0) =1a(1) =1a(2) =3a(3) =4a(4) =60a(5) =30a(6) =2520a(7) =6720a(8) =45360a(9) =604800a(10) =19958400a(11) =3991680a(12) =3113510400a(13) =14529715200a(14) =163459296000

External references