Expansion of o.g.f. x*(1 - x + x^2)/(1 -3*x +x^2 +3*x^3 -2*x^4).

Terms

a(0) =0a(1) =1a(2) =2a(3) =6a(4) =13a(5) =29a(6) =60a(7) =124a(8) =251a(9) =507a(10) =1018a(11) =2042a(12) =4089a(13) =8185a(14) =16376a(15) =32760a(16) =65527a(17) =131063a(18) =262134a(19) =524278a(20) =1048565a(21) =2097141a(22) =4194292a(23) =8388596a(24) =16777203a(25) =33554419a(26) =67108850a(27) =134217714a(28) =268435441a(29) =536870897