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A333031 Number of vertices in an equilateral triangle "frame" of size n (see Comments in A328526 for definition). 6
3, 10, 58, 183, 408, 777, 1323, 2142, 3276, 4773, 6717, 9264, 12507, 16554, 21351, 27090, 34047, 42318, 52008, 63453, 76566, 91371, 108249, 127608, 149487, 173982, 201072, 231225, 265002, 302487, 343857, 389856, 440175, 494670, 553611, 617610, 687477, 763320 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
For n<=3 the terms equal A274585(n). See A328526 for images of the triangular frame.
LINKS
CROSSREFS
Cf. A328526 (regions), A333030 (edges), A333032 (3-gons), A333033 (4-gons), A331776 (square frame), A274586 (filled triangle).
Sequence in context: A307906 A366696 A274585 * A242953 A112101 A159321
KEYWORD
nonn
AUTHOR
EXTENSIONS
a(12) and beyond from Lars Blomberg, May 01 2020
STATUS
approved

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Last modified March 18 22:56 EDT 2024. Contains 370952 sequences. (Running on oeis4.)