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

Terms

a(0) =0a(1) =1a(2) =2a(3) =9a(4) =18a(5) =39a(6) =72a(7) =126a(8) =204a(9) =324a(10) =484a(11) =710a(12) =1008a(13) =1401a(14) =1902a(15) =2547a(16) =3342a(17) =4335a(18) =5544a(19) =7012a(20) =8768a(21) =10872a(22) =13344a(23) =16260a(24) =19656a(25) =23601a(26) =28146a(27) =33381a(28) =39346a(29) =46151