

A244362


Total number of toothpicks after nth stage in the toothpick structure of the symmetric representation of sigma in the first quadrant (without the axes x and y).


4



2, 6, 12, 20, 28, 40, 50, 66, 82, 102, 116, 140, 156, 182, 208, 240, 260, 296, 318, 358, 394, 432, 458, 506, 540, 584, 628, 684
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OFFSET

1,1


COMMENTS



LINKS



FORMULA



EXAMPLE

Illustration of the structure after 7 stages (Contains 50 toothpicks):
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. _      
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. 1 2 3 4 5 6 7
.


CROSSREFS



KEYWORD

nonn,more


AUTHOR



EXTENSIONS



STATUS

approved



