Expansion of 1/((1-x)(1-3x)(1-6x)).

Terms

a(0) =1a(1) =10a(2) =73a(3) =478a(4) =2989a(5) =18298a(6) =110881a(7) =668566a(8) =4021237a(9) =24156946a(10) =145030249a(11) =870447214a(12) =5223480445a(13) =31343274154a(14) =188066819377