Triangular array: the fission of ((2x+1)^n) by (q(n,x)), where q(n,x)=x^n+x^(n-1)+...+x+1.

Terms

a(0) =1a(1) =1a(2) =5a(3) =1a(4) =7a(5) =19a(6) =1a(7) =9a(8) =33a(9) =65a(10) =1a(11) =11a(12) =51a(13) =131a(14) =211a(15) =1a(16) =13a(17) =73a(18) =233a(19) =473a(20) =665a(21) =1a(22) =15a(23) =99a(24) =379a(25) =939a(26) =1611a(27) =2059a(28) =1a(29) =17