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) = t(n).
A069009
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) = t(n).
Terms
- a(0) =1a(1) =3a(2) =15a(3) =59a(4) =250a(5) =1030a(6) =4283a(7) =17752a(8) =73658a(9) =305513a(10) =1267344a(11) =5257031a(12) =21806850a(13) =90457205a(14) =375227042a(15) =1556484658a(16) =6456477531a(17) =26782210229a(18) =111095686086a(19) =460837670465
External references
- oeis: A069009