Expansion of g.f. x*(1 + x)*(1 + 6*x + x^2)/(1 - x)^7.

Terms

a(0) =0a(1) =1a(2) =14a(3) =84a(4) =330a(5) =1001a(6) =2548a(7) =5712a(8) =11628a(9) =21945a(10) =38962a(11) =65780a(12) =106470a(13) =166257a(14) =251720a(15) =371008a(16) =534072a(17) =752913a(18) =1041846a(19) =1417780a(20) =1900514a(21) =2513049a(22) =3281916a(23) =4237520a(24) =5414500a(25) =6852105a(26) =8594586a(27) =10691604a(28) =13198654a(29) =16177505