Sequence encyclopaedia

Sequence encyclopaedia

The Encyclopedia of Integer Sequences outgrows its creator

When Neil Sloane was a young man, he started collecting objects he found beautiful. A common enough preoccupation perhaps, except for the particular objects Sloane chose: number sequences.

He has classical sequences that have captivated mathematicians for millennia, like 2, 3, 5, 7, 11, 13..., the prime numbers. He has tricky sequences like 1, 1, 2, 5, 14, 38, 120, 353..., the numbers of different ways of folding ever-longer strips of postage stamps. He even has sequences that might wreck your life. Read this one at your peril:
0, 1, 3, 6, 2, 7, 13, 20, 12,... (A005132).

Sloane's encyclopaedia is here:
http://www.research.att.com/~njas/sequences/
Read more about it Science News:
http://www.sciencenews.org/view/generic/id/61870/title/Math_Trek__The_pattern_collector