a(n) = phi(A291789(n)).

Terms

a(0) =72a(1) =120a(2) =200a(3) =352a(4) =792a(5) =280a(6) =480a(7) =464a(8) =1008a(9) =1240a(10) =1152a(11) =1088a(12) =2496a(13) =2304a(14) =2688a(15) =3360a(16) =4560a(17) =7920a(18) =8960a(19) =22080a(20) =19520a(21) =47040a(22) =28640a(23) =61440a(24) =82400a(25) =137760a(26) =126336a(27) =207360a(28) =319488a(29) =552960