a(n) = coefficient in the power series expansion of A(x) = Sum_{n=-oo..+oo} x^n * (1-x)^n * ((1-x)^n + x^n)^n.

A356776

a(n) = coefficient in the power series expansion of A(x) = Sum_{n=-oo..+oo} x^n * (1-x)^n * ((1-x)^n + x^n)^n.

Terms

    a(0) =2a(1) =1a(2) =1a(3) =-3a(4) =7a(5) =15a(6) =-39a(7) =-307a(8) =917a(9) =2540a(10) =-16939a(11) =-25016a(12) =441962a(13) =-498346a(14) =-10210949a(15) =42714405a(16) =195220459a(17) =-2142879945a(18) =532985665a(19) =83535107090a(20) =-365902332521

External references