G.f.: (2*x+4*x^2+4*x^3+4*x^4+2*x^5)/((1-x)^2*(1-x^2)^3*(1-x^3)^4*(1-x^4)).

Terms

a(0) =0a(1) =2a(2) =8a(3) =24a(4) =64a(5) =148a(6) =312a(7) =620a(8) =1160a(9) =2070a(10) =3560a(11) =5912a(12) =9528a(13) =14974a(14) =22984a(15) =34548a(16) =50984a(17) =73958a(18) =105624a(19) =148744a(20) =206728a(21) =283854a(22) =385448a(23) =517964a(24) =689304a(25) =909088a(26) =1188784a(27) =1542168a(28) =1985704a(29) =2538754