Coefficient of x^n in the expansion of ( (1+x)^2 * (1+x^2)^2 )^n.

A370195

Coefficient of x^n in the expansion of ( (1+x)^2 * (1+x^2)^2 )^n.

Terms

    a(0) =1a(1) =2a(2) =10a(3) =56a(4) =322a(5) =1902a(6) =11440a(7) =69680a(8) =428418a(9) =2653292a(10) =16527910a(11) =103443144a(12) =649964176a(13) =4097464490a(14) =25904239560a(15) =164168677056

External references