Coefficient of x^n in the expansion of ( (1-x) / (1-x-x^3) )^n.

Terms

a(0) =1a(1) =0a(2) =0a(3) =3a(4) =4a(5) =5a(6) =27a(7) =63a(8) =116a(9) =354a(10) =945a(11) =2123a(12) =5563a(13) =14846a(14) =36519a(15) =93083a(16) =244068a(17) =622013a(18) =1590318a(19) =4131265a(20) =10658969a(21) =27440808a(22) =71127683a(23) =184324461a(24) =476969939a(25) =1237420755a(26) =3213687698a(27) =8343223779a(28) =21682184311a(29) =56400917786