Expansion of 1/(1 - Sum_{k>=2} (1 - floor(2/d(k)))*x^k), where d(k) is the number of divisors (A000005).
A280544
Expansion of 1/(1 - Sum_{k>=2} (1 - floor(2/d(k)))*x^k), where d(k) is the number of divisors (A000005).
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =0a(6) =1a(7) =0a(8) =2a(9) =1a(10) =3a(11) =0a(12) =5a(13) =2a(14) =8a(15) =3a(16) =13a(17) =5a(18) =22a(19) =10a(20) =34a(21) =18a(22) =58a(23) =31a(24) =94a(25) =57a(26) =153a(27) =99a(28) =254a(29) =172
External references
- oeis: A280544