Coefficient of x^n in the expansion of ( 1/(1-x) * (1+x^2)^2 )^n.
A370243
Coefficient of x^n in the expansion of ( 1/(1-x) * (1+x^2)^2 )^n.
Terms
- a(0) =1a(1) =1a(2) =7a(3) =28a(4) =143a(5) =701a(6) =3580a(7) =18376a(8) =95471a(9) =499231a(10) =2626607a(11) =13883904a(12) =73681316a(13) =392323868a(14) =2094932728a(15) =11214085328a(16) =60157698287a(17) =323325959395
External references
- oeis: A370243