List of pairs: {(n*(n+1)/2)^2, (n!)^3}.

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =9a(5) =8a(6) =36a(7) =216a(8) =100a(9) =13824a(10) =225a(11) =1728000a(12) =441a(13) =373248000a(14) =784a(15) =128024064000a(16) =1296a(18) =2025a(20) =3025a(22) =4356a(24) =6084