a(n)=the (1,1)-term of M^(n-1), where M=matrix(5,5, [3,-1,-1,-1,-1; 1,3,-1,-1,-1; 1,1,3,-1,-1; 1,1,1,3,-1; 1,1,1,1,3]).

A123220

a(n)=the (1,1)-term of M^(n-1), where M=matrix(5,5, [3,-1,-1,-1,-1; 1,3,-1,-1,-1; 1,1,3,-1,-1; 1,1,1,3,-1; 1,1,1,1,3]).

Terms

    a(0) =1a(1) =3a(2) =5a(3) =-9a(4) =-99a(5) =-297a(6) =389a(7) =8655a(8) =46573a(9) =122823a(10) =-120491a(11) =-3003393a(12) =-15885315a(13) =-40246281a(14) =50400229a(15) =1040606127a(16) =5296630541a(17) =12512952615a(18) =-22872751243a(19) =-368600380833

External references