a(1) = 1, a(n+1) is the largest square <= n*a(n).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =16a(6) =81a(7) =529a(8) =4225a(9) =38025a(10) =379456a(11) =4173849a(12) =50083929a(13) =651066256a(14) =9114902784a(15) =136723197121