B737-400
On the -400, on the CDU, look at the 'Take-off Ref' page.
The N1 for take-off is shown for each engine (depending on FMC version). I believe even the earliest versions include this information. The figures will depend on the engine bleed configuration e.g. with an engine bleed on, the thrust on that particular engine will be different to the 'engine bleed off' condition.
Of course, this information is also comprehensively provided in the QRH performance section as 'Capt Chambo' stated.
Hope that helps !!!