Expansion of 1/(1+x+2*x^3).

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-3a(4) =5a(5) =-7a(6) =13a(7) =-23a(8) =37a(9) =-63a(10) =109a(11) =-183a(12) =309a(13) =-527a(14) =893a(15) =-1511a(16) =2565a(17) =-4351a(18) =7373a(19) =-12503a(20) =21205a(21) =-35951a(22) =60957a(23) =-103367a(24) =175269a(25) =-297183a(26) =503917a(27) =-854455a(28) =1448821a(29) =-2456655