G.f.: exp( Sum_{n>=1} A181411(n)*x^n/n ) where A181411(n) = Sum_{k=0..n} C(n,k)*sigma(n+k).
A181410
G.f.: exp( Sum_{n>=1} A181411(n)*x^n/n ) where A181411(n) = Sum_{k=0..n} C(n,k)*sigma(n+k).
Terms
- a(0) =1a(1) =4a(2) =17a(3) =65a(4) =234a(5) =804a(6) =2664a(7) =8571a(8) =26908a(9) =82721a(10) =249758a(11) =742178a(12) =2174623a(13) =6291982a(14) =17998815a(15) =50957814a(16) =142913510a(17) =397339309a(18) =1095887091a(19) =3000130003a(20) =8156568197a(21) =22032636494a(22) =59155443318a(23) =157925193036a(24) =419353166885
External references
- oeis: A181410