O.g.f.: exp( Sum_{n>=1} (sigma(2n)-sigma(n))^n * x^n/n ).
A177399
O.g.f.: exp( Sum_{n>=1} (sigma(2n)-sigma(n))^n * x^n/n ).
Terms
- a(0) =1a(1) =2a(2) =10a(3) =188a(4) =1414a(5) =53596a(6) =2923652a(7) =44668152a(8) =651967302a(9) =605335444140
External references
- oeis: A177399