E.g.f.: Sum_{n>=0} x^n * (1 + x^n)^n * exp(3*x^(n+1)) / n!.
A259203
E.g.f.: Sum_{n>=0} x^n * (1 + x^n)^n * exp(3*x^(n+1)) / n!.
Terms
- a(0) =1a(1) =4a(2) =12a(3) =46a(4) =178a(5) =964a(6) =4690a(7) =42508a(8) =285442a(9) =2015524a(10) =34230250a(11) =201756988a(12) =2251838962a(13) =46808034004a(14) =448004334970
External references
- oeis: A259203