Let M denote the 6 X 6 matrix with rows /1,1,1,1,1,1/1,1,1,1,1,0/1,1,1,1,0,0/1,1,1,0,0,0/1,1,0,0,0,0/1,0,0,0,0,0/ and A(n) the vector (x(n),y(n),z(n),t(n),u(n),v(n)) = M^n*A where A is the vector (1,1,1,1,1,1); then a(n) = y(n).

A069007

Let M denote the 6 X 6 matrix with rows /1,1,1,1,1,1/1,1,1,1,1,0/1,1,1,1,0,0/1,1,1,0,0,0/1,1,0,0,0,0/1,0,0,0,0,0/ and A(n) the vector (x(n),y(n),z(n),t(n),u(n),v(n)) = M^n*A where A is the vector (1,1,1,1,1,1); then a(n) = y(n).

Terms

    a(0) =1a(1) =5a(2) =20a(3) =85a(4) =350a(5) =1456a(6) =6034a(7) =25038a(8) =103849a(9) =430794a(10) =1786960a(11) =7412548a(12) =30748055a(13) =127546530a(14) =529077571a(15) =2194674687a(16) =9103762600a(17) =37763453591a(18) =156647144355a(19) =649790354877

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