a(n) is the (2n)-th term of the n-fold self-convolution of the Euler totient function phi.
A340994
a(n) is the (2n)-th term of the n-fold self-convolution of the Euler totient function phi.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =19a(4) =89a(5) =391a(6) =1817a(7) =8429a(8) =39697a(9) =187849a(10) =894965a(11) =4282191a(12) =20572961a(13) =99158645a(14) =479294877a(15) =2322365959a(16) =11276837761a(17) =54860498415a(18) =267336028565
External references
- oeis: A340994