Expansion of g.f. 1/((1-x)*(1-2*x)*(1-3*x)*(1-5*x)).

Terms

a(0) =1a(1) =11a(2) =80a(3) =490a(4) =2751a(5) =14721a(6) =76630a(7) =392480a(8) =1990901a(9) =10041031a(10) =50466780a(11) =253122870a(12) =1267989451a(13) =6347088941a(14) =31756902530a(15) =158848951660a(16) =794438206401