a(0) = 15; for n > 0, a(n) is the smallest triangular number which is a (proper) multiple of a(n-1).

A068513

a(0) = 15; for n > 0, a(n) is the smallest triangular number which is a (proper) multiple of a(n-1).

Terms

    a(0) =15a(1) =45a(2) =630a(3) =25200a(4) =32004000a(5) =508031496000

External references