Generating formulae for polygonal numbers (triangular, square, pentagonal...)
This blog post has moved to https://matthewvaneerde.wordpress.com/2011/04/29/generating-formulae-for-polygonal-numbers-triangular-square-pentagonal/
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This blog post has moved to https://matthewvaneerde.wordpress.com/2011/04/29/generating-formulae-for-polygonal-numbers-triangular-square-pentagonal/