G.f.: (1-16*x+28*x^2+56*x^3-140*x^4+56*x^5+28*x^6-16*x^7+x^8)/(x^2-x+1)^8.

Terms

a(0) =1a(1) =-8a(2) =-72a(3) =-120a(4) =330a(5) =1584a(6) =1716a(7) =-3432a(8) =-12870a(9) =-11440a(10) =19448a(11) =63648a(12) =50388a(13) =-77520a(14) =-232560a(15) =-170544a(16) =245157a(17) =692208a(18) =480700a(19) =-657800a(20) =-1776060a(21) =-1184040a(22) =1560780a(23) =4071600a(24) =2629575a(25) =-3365856a(26) =-8544096a(27) =-5379616