Coefficient of x^n in the expansion of ( (1+x+x^2)^3 / (1+x) )^n.
A372369
Coefficient of x^n in the expansion of ( (1+x+x^2)^3 / (1+x) )^n.
Terms
- a(0) =1a(1) =2a(2) =12a(3) =65a(4) =388a(5) =2352a(6) =14565a(7) =91289a(8) =577764a(9) =3683459a(10) =23621462a(11) =152203482a(12) =984598741a(13) =6390596591a(14) =41596873869a(15) =271424778015
External references
- oeis: A372369