a(1)=1, a(n)= least odd triangular number which is a proper multiple of a(n-1) with a multiplier different from the ones used earlier.

A088109

a(1)=1, a(n)= least odd triangular number which is a proper multiple of a(n-1) with a multiplier different from the ones used earlier.

Terms

    a(0) =1a(1) =3a(2) =15a(3) =105a(4) =2415a(5) =26565a(6) =1567335a(7) =2785154295

External references