Let M denote the 5 X 5 matrix with rows /1,1,1,1,1/1,1,1,1,0/1,1,1,0,0/1,1,0,0,0/1,0,0,0,0/ and A(n) = vector (x(n),y(n),z(n),t(n),u(n)) = M^n*A where A is the vector (1,1,1,1,1); then a(n) = t(n).
A069006
Let M denote the 5 X 5 matrix with rows /1,1,1,1,1/1,1,1,1,0/1,1,1,0,0/1,1,0,0,0/1,0,0,0,0/ and A(n) = vector (x(n),y(n),z(n),t(n),u(n)) = M^n*A where A is the vector (1,1,1,1,1); then a(n) = t(n).
Terms
- a(0) =1a(1) =2a(2) =9a(3) =29a(4) =105a(5) =365a(6) =1287a(7) =4516a(8) =15873a(9) =55759a(10) =195910a(11) =688286a(12) =2418195a(13) =8495917a(14) =29849041a(15) =104869718a(16) =368442700a(17) =1294463368a(18) =4547886208a(19) =15978257251a(20) =56137003923a(21) =197228218022a(22) =692929213991
External references
- oeis: A069006