Coefficients of x^(n*(n+2)) in Sum_{n>=0} x^n * (1 + x^n)^n / (1 + x^(n+1))^(n+1).
A323677
Coefficients of x^(n*(n+2)) in Sum_{n>=0} x^n * (1 + x^n)^n / (1 + x^(n+1))^(n+1).
Terms
- a(0) =1a(1) =-2a(2) =8a(3) =-36a(4) =128a(5) =-288a(6) =1166a(7) =-16048a(8) =77328a(9) =-108780a(10) =220440a(11) =-5900816a(12) =44395366a(13) =-339891804a(14) =898603106a(15) =-5623621248a(16) =2160154604a(17) =-22569496436a(18) =930080367404
External references
- oeis: A323677