

A337330


Irregular table read by rows: row n gives the number of 6gon to kgon contacts, with k>=6, for a regular ngon with all diagonals drawn, with n>=25.


5



50, 0, 108, 0, 0, 0, 124, 32, 66, 136, 70, 144, 148, 76, 390, 120, 328, 82, 42, 86, 86, 0, 540, 92, 92, 188, 94, 94, 0, 196, 98, 750, 100, 816, 416, 104, 1272, 432, 220, 110, 728, 570, 570, 406, 348, 116, 1062, 354, 300, 854, 366, 122, 1488, 124, 1512, 252, 126, 576, 2080, 130, 260, 2112
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OFFSET

25,1


COMMENTS

For n=3 to n=24 there are no ngons that have 6gon to kgon contacts, where k>=6, so the table starts at n=25.
See A333654 for the number of 3gon to kgon contacts, with k>=3.
See A335614 for the number of 4gon to kgon contacts, with k>=4.
See A335646 for the number of 5gon to kgon contacts, with k>=5.
See A007678 for the number of regions and images of other ngons.


LINKS

Table of n, a(n) for n=25..86.
Scott R. Shannon, Image for n=25 with edgenumber coloring. This is the first ngon with 6gon to 6gon contacts.
Scott R. Shannon, Image for n=25 with random distancebased coloring.


EXAMPLE

The table begins:
.
50;
0;
108;
0;
0;
0;
124;
32;
66;
136;
70;
144;
148;
76;
390;
120;
328, 82;
42;


CROSSREFS

Cf. A333654 (3gon contacts), A335614 (4gon contacts), A335646 (5gon contacts), A007678, A135565, A007569, A062361, A331450, A331451.
Sequence in context: A324676 A015066 A022078 * A174914 A036172 A242075
Adjacent sequences: A337327 A337328 A337329 * A337331 A337332 A337333


KEYWORD

nonn,tabf,changed


AUTHOR

Scott R. Shannon, Aug 23 2020


EXTENSIONS

a(34) and beyond from Scott R. Shannon, Jan 11 2021


STATUS

approved



