Thank you!

It seems like the FindSequenceFunctin works with the list of numbers, not with the one type of long variable.;

The type of term that I want to abbreviate is like:

(Sqrt[3] *F* (u[1, 0] - 2 u[1, 1] + u[1, 2] + 2 (u[2, 0] - 2 u[2, 1] + u[2, 2])))/(2 \(u[1, 0]^2 + 3 u[1, 1]^2 + 3 u[1, 2]^2 - 3 u[1, 2] u[1, 3] + u[1, 3]^2 + 2 u[1, 3] u[2, 0] + u[2, 0]^2 - 6 u[1, 2] u[2, 1] - 3 u[2, 0] u[2, 1] + 3 u[2, 1]^2 + 12 u[1, 2] u[2, 2] - 6 u[1, 3] u[2, 2] - 3 u[2, 1] u[2, 2] + 3 u[2, 2]^2 - 3 u[1, 1] (u[1, 2] + 2 (u[2, 0] - 2 u[2, 1] + u[2, 2])) + (-6 u[1, 2] + 4 u[1, 3] + u[2, 0] - 3 u[2, 2]) u[2, 3] + u[2, 3]^2 + u[1, 0] (-3 u[1, 1] + u[1, 3] + 4 u[2, 0] - 6 u[2, 1] + 2 u[2, 3])))

-> which is like a very long one number, not the list of numbers.

If this is so, is there any other function that may work with this sort of problem?

If not, is there any alternative software that can do this sort of work..?

Thank you very very much again!