help sequences

annoymage

1. The problem statement, all variables and given/known data

help me to make this into one equation please T-T

[itex]T_1=(1^2+1)[/itex]
[itex]T_2=(2^2+1)(1^2+1)[/itex]
[itex]T_3=(3^2+1)(2^2+1)(1^2+1)[/itex]
[itex]T_4=(4^2+1)(3^2+1)(2^2+1)(1^2+1)[/itex]

i don't want this form [itex]T_n= \prod ^{n}_{i} (i^2+1)[/itex]

it will be some kind of factorial i hope