Tue May 09 2017 at 1:08:35 Holy mole! The last writeup on this node is almost 12 years old! A lot has happened since. The On-Line Encyclopedia of Integer Sequences is an onlinedatabase of (have you guessed it?) sequences of Integers (the set of numbers commonly denoted by ℤ) founded by Neil Sloane. 1 The encyclopedia began in 1964. Sloane was working on his dissertation, when he came across a certain sequence (1, 8, 78, 944…) 2 and was looking for a formula to derive the n-th number in the sequence. His research at the Cornell University library led him to similar sequences, though not the exact one he was looking for. Since smartphones weren’t around then, Sloane recorded these sequences in file cards sorted lexicographically.