Expansion of g.f. (1 + 4*x)/(1 - 17*x^2).

Terms

a(0) =1a(1) =4a(2) =17a(3) =68a(4) =289a(5) =1156a(6) =4913a(7) =19652a(8) =83521a(9) =334084a(10) =1419857a(11) =5679428a(12) =24137569a(13) =96550276a(14) =410338673a(15) =1641354692a(16) =6975757441a(17) =27903029764a(18) =118587876497a(19) =474351505988