Coefficients of x^(n*(n+3)) in Sum_{n>=0} x^n * (1 + x^n)^n / (1 + x^(n+1))^(n+1).
A323678
Coefficients of x^(n*(n+3)) in Sum_{n>=0} x^n * (1 + x^n)^n / (1 + x^(n+1))^(n+1).
Terms
- a(0) =1a(1) =2a(2) =12a(3) =50a(4) =72a(5) =142a(6) =5346a(7) =38338a(8) =240902a(9) =1369462a(10) =8927272a(11) =29594702a(12) =78001922a(13) =259042422a(14) =2690290778a(15) =26069217364a(16) =144738683318a(17) =959061370318
External references
- oeis: A323678