Recip transform of 2*(1 + x^3 + x^4)-1/(1-x).

Terms

a(0) =1a(1) =1a(2) =3a(3) =9a(4) =31a(5) =113a(6) =431a(7) =1699a(8) =6869a(9) =28337a(10) =118827a(11) =505077a(12) =2171403a(13) =9426025a(14) =41260639a(15) =181923359a(16) =807230625a(17) =3601980785a(18) =16152883683a(19) =72760511753a(20) =329066924255