Coefficient of x^n in the expansion of ( (1-x+x^3) / (1-x)^2 )^n.
A372414
Coefficient of x^n in the expansion of ( (1-x+x^3) / (1-x)^2 )^n.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =13a(4) =55a(5) =231a(6) =981a(7) =4215a(8) =18271a(9) =79735a(10) =349843a(11) =1541783a(12) =6820045a(13) =30263689a(14) =134658681a(15) =600578373a(16) =2684116863a(17) =12017803439a(18) =53895617379a(19) =242054324055
External references
- oeis: A372414