From The Free On-line Dictionary of Computing (18 March 2015) :
Lincoln Reckoner An interactive mathematics program including matrix operations, written about 1965. It ran on the TX-2. ["The Lincoln Reckonere: An Operation-Oriented On-line Facility with Distributed Control", A.N. Stowe et al, Proc FJCC 29 (1966)]. [Sammet 1969, pp. 245-247].