Expansion of g.f. x*(1 +4*x +4*x^2 +18*x^3 +7*x^4 +7*x^5 -2*x^6 -x^7 -x^8 -x^9) / (1-20*x^6+x^12).

Terms

a(0) =0a(1) =1a(2) =4a(3) =4a(4) =18a(5) =7a(6) =7a(7) =18a(8) =79a(9) =79a(10) =359a(11) =140a(12) =140a(13) =359a(14) =1576a(15) =1576a(16) =7162a(17) =2793a(18) =2793a(19) =7162a(20) =31441a(21) =31441a(22) =142881a(23) =55720a(24) =55720a(25) =142881a(26) =627244a(27) =627244a(28) =2850458a(29) =1111607