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

Terms

a(0) =1a(1) =2a(2) =5a(3) =13a(4) =33a(5) =84a(6) =214a(7) =545a(8) =1388a(9) =3535a(10) =9003a(11) =22929a(12) =58396a(13) =148724a(14) =378773a(15) =964666a(16) =2456829a(17) =6257097a(18) =15935689a(19) =40585304a(20) =103363394a(21) =263247781a(22) =670444260a(23) =1707499695a(24) =4348691431a(25) =11075326817a(26) =28206844760a(27) =71837707768a(28) =182957587113a(29) =465959726754