Expansion of g.f. -(1+27*x^2)/((1+3*x)*(1-2*x+9*x^2)).

Terms

a(0) =-1a(1) =1a(2) =-25a(3) =49a(4) =-1a(5) =529a(6) =-1849a(7) =289a(8) =-9025a(9) =58081a(10) =-38809a(11) =108241a(12) =-1560001a(13) =2283121a(14) =-525625a(15) =35796289a(16) =-95863681a(17) =2666689a(18) =-681575449a(19) =3261894769a(20) =-1289169025a(21) =9906021841a(22) =-94109673529a(23) =99199171681a(24) =-84332740801a(27) =46970592529