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Heptadecagonal 1/2(15n2 − 13n) 1 17 48 94 155 231 322 428 549 685 A051869 18
Octadecagonal 1/2(16n2 − 14n) 1 18 51 100 165 246 343 456 585 730 4/7 ln 2 − √2/14...
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Octadecagonal petrie polygons A17 B9 D10 E7 17-simplex 9-orthoplex 9-cube 711 171 321 231 132...
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topologically distinct forms of an enneadecahedron, for
example the
octadecagonal (18-sided) pyramid, or the
heptadecagonal (17-sided) prism; the latter...
