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) = z(n).
A069008
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) = z(n).
Terms
- a(0) =1a(1) =4a(2) =18a(3) =74a(4) =309a(5) =1280a(6) =5313a(7) =22035a(8) =91410a(9) =379171a(10) =1572857a(11) =6524375a(12) =27063881a(13) =112264055a(14) =465684247a(15) =1931711700a(16) =8012962189a(17) =33238687760a(18) =137877896315a(19) =571933356551
External references
- oeis: A069008