vertices = 3 + 1 x inserted; n = 3; diff = 1
v = 3 + 1 inserted + center; n = 4; diff = 1
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vertices = 4 + 1 x inserted; n = 5; diff = 1
Another variant is to specify that a vertex chosen at cycle cn is not to be chosen again until cycle cn+t.
v = 4; n = 1; t = 2
v = 4 + center; n = 1; t = 2
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v = 5; n = 1; t = 2
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v = 5; n = 1; t = 3
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v = 6; n = 2; t = 2
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Other variants are left as an exercise for the recreational mathematician:
v = 4; n = 2; t = 2
v = 5; n = 2; t = 2
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Yet More Unnested Sierpinski Polygons
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