Coefficient of x^n in the expansion of ( 1/(1-x) * (1+x^2)^3 )^n.
A370244
Coefficient of x^n in the expansion of ( 1/(1-x) * (1+x^2)^3 )^n.
Terms
- a(0) =1a(1) =1a(2) =9a(3) =37a(4) =221a(5) =1176a(6) =6759a(7) =38368a(8) =222189a(9) =1290367a(10) =7551534a(11) =44367918a(12) =261789647a(13) =1549582126a(14) =9198837384a(15) =54740021712a(16) =326445873389
External references
- oeis: A370244