A figurate number of the form 
giving the area of the square gnomon obtained by removing a square of side 
from a square of side 
,
giving the area of the square gnomon obtained by removing a square of side from a square of side , |  |  |
(1)
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(2)
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The gnomonic numbers are therefore equivalent to the odd numbers, and the first few are 1, 3, 5, 7, 9, 11, ... (Sloane's A005408). The generating function for the gnomonic numbers is
 Ref: mathworld.wolfram.com |
(3)
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