Expansion of 1/((1-2x)(1-5x)(1-6x)).

Terms

a(0) =1a(1) =13a(2) =117a(3) =905a(4) =6461a(5) =43953a(6) =289717a(7) =1868425a(8) =11861421a(9) =74423393a(10) =462815717a(11) =2858273145a(12) =17556537181a(13) =107373722833a(14) =654414852117