Euler's totient of A104357(n) = A104350(n) - 1.

Terms

a(0) =1a(1) =4a(2) =10a(3) =58a(4) =178a(5) =1258a(6) =2280a(7) =7558a(8) =37798a(9) =415798a(10) =1229760a(11) =16144536a(12) =113488440a(13) =567495336a(14) =1135133998a(15) =19295619336a(16) =56915913600