Diagonal of rational function 1/(1 - (1 + x*y) * (x^2 + y^2)).

Terms

a(0) =1a(1) =0a(2) =2a(3) =4a(4) =8a(5) =24a(6) =56a(7) =144a(8) =376a(9) =960a(10) =2512a(11) =6560a(12) =17184a(13) =45248a(14) =119296a(15) =315392a(16) =835552a(17) =2217216a(18) =5893568a(19) =15687552a(20) =41810944a(21) =111567104a(22) =298016512a(23) =796832256a(24) =2132456704a(25) =5711486976a(26) =15309014528a(27) =41062927360a(28) =110213725184a(29) =295995574272