G.f.: (1 + 5*x + 5*x^2 + x^3)/Product_{i=1..10} (1 - x^i).

Terms

a(0) =1a(1) =6a(2) =12a(3) =19a(4) =31a(5) =49a(6) =74a(7) =110a(8) =159a(9) =226a(10) =317a(11) =437a(12) =590a(13) =789a(14) =1043a(15) =1364a(16) =1769a(17) =2275a(18) =2899a(19) =3670a(20) =4612a(21) =5758a(22) =7145a(23) =8814a(24) =10812a(25) =13202a(26) =16040a(27) =19396a(28) =23354a(29) =28006