Coefficient of x^n in the expansion of ( (1+x+x^3)^3 / (1+x) )^n.
A372372
Coefficient of x^n in the expansion of ( (1+x+x^3)^3 / (1+x) )^n.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =29a(4) =154a(5) =792a(6) =4047a(7) =20967a(8) =110058a(9) =582257a(10) =3096516a(11) =16539690a(12) =88684291a(13) =477080671a(14) =2573652045a(15) =13917256254a(16) =75417513498a(17) =409447753305
External references
- oeis: A372372