(1+7*x-6*x^2)/(1-4*x-8*x^2+6*x^3).

Terms

a(0) =1a(1) =11a(2) =46a(3) =266a(4) =1366a(5) =7316a(6) =38596a(7) =204716a(8) =1083736a(9) =5741096a(10) =30405976a(11) =161050256a(12) =853002256a(13) =4517975216a(14) =23929617376a(15) =126744257696a(16) =671306118496