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

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =15a(5) =35a(6) =79a(7) =179a(8) =407a(9) =923a(10) =2095a(11) =4755a(12) =10791a(13) =24491a(14) =55583a(15) =126147a(16) =286295a(17) =649755a(18) =1474639a(19) =3346739a(20) =7595527a(21) =17238283a(22) =39122815a(23) =88790435a(24) =201512631a(25) =457339131a(26) =1037945263a(27) =2355648787a(28) =5346217575a(29) =12133405675