The second Jordan totient function applied to the squares.

Terms

a(0) =1a(1) =12a(2) =72a(3) =192a(4) =600a(5) =864a(6) =2352a(7) =3072a(8) =5832a(9) =7200a(10) =14520a(11) =13824a(12) =28392a(13) =28224a(14) =43200a(15) =49152a(16) =83232a(17) =69984a(18) =129960a(19) =115200a(20) =169344a(21) =174240a(22) =279312a(23) =221184a(24) =375000a(25) =340704a(26) =472392a(27) =451584a(28) =706440a(29) =518400