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

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =13a(5) =24a(6) =45a(7) =84a(8) =157a(9) =293a(10) =547a(11) =1021a(12) =1906a(13) =3558a(14) =6642a(15) =12399a(16) =23146a(17) =43208a(18) =80659a(19) =150571a(20) =281080a(21) =524709a(22) =979506a(23) =1828503a(24) =3413377a(25) =6371957a(26) =11894917a(27) =22204960a(28) =41451340a(29) =77379720