Expansion of x^9/((1-x)*(1-x^2)*(1-x^3))^2.

Terms

a(0) =1a(1) =2a(2) =5a(3) =10a(4) =18a(5) =30a(6) =49a(7) =74a(8) =110a(9) =158a(10) =221a(11) =302a(12) =407a(13) =536a(14) =698a(15) =896a(16) =1136a(17) =1424a(18) =1770a(19) =2176a(20) =2656a(21) =3216a(22) =3866a(23) =4616a(24) =5481a(25) =6466a(26) =7591a(27) =8866a(28) =10306a(29) =11926