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

Terms

a(0) =1a(1) =3a(2) =15a(3) =55a(4) =198a(5) =681a(6) =2263a(7) =7341a(8) =23331a(9) =72928a(10) =224814a(11) =684882a(12) =2065346a(13) =6173466a(14) =18310212a(15) =53935350a(16) =157904130a(17) =459755694a(18) =1332010954a(19) =3841812480a(20) =11035346151a(21) =31579747613a(22) =90061069065a(23) =256028590665a(24) =725715896698