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

Terms

a(0) =1a(1) =10a(2) =64a(3) =334a(4) =1549a(5) =6652a(6) =27064a(7) =105796a(8) =401041a(9) =1483606a(10) =5380840a(11) =19198306a(12) =67559437a(13) =234963352a(14) =808919632a(15) =2760370984a(16) =9346519297a(17) =31429487170a(18) =105039380080a(19) =349114288150