a(n) is the smallest number with exactly n divisors that are square pyramidal numbers.

Terms

a(0) =1a(1) =5a(2) =30a(3) =140a(4) =420a(5) =1540a(6) =4620a(7) =13860a(8) =78540a(9) =157080a(10) =471240a(11) =1141140a(12) =3603600a(13) =3423420a(14) =13693680a(15) =30630600a(16) =58198140a(17) =116396280a(18) =214414200a(19) =428828400a(20) =581981400a(21) =1163962800a(22) =5354228880a(23) =4073869800a(24) =8147739600a(25) =26771144400a(26) =36082846800a(27) =80313433200a(28) =93699005400a(29) =187398010800