Expansion of 1/((1-2x)(1-3x)(1-4x)(1-6x)).

Terms

a(0) =1a(1) =15a(2) =145a(3) =1155a(4) =8281a(5) =55755a(6) =360865a(7) =2276835a(8) =14126761a(9) =86681595a(10) =527948785a(11) =3199656915a(12) =19327384441a(13) =116486845035a(14) =701025539905