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A332377
One-third of total number of edges in graph formed by the straight line segments connecting the edges of an equilateral triangle with the n-1 points resulting from a subdivision of the sides into n equal pieces.
3
1, 4, 13, 18, 41, 48, 85, 94, 145, 156, 221, 234, 313, 328, 415, 438, 545, 564, 685, 700, 841, 864, 1013, 1014, 1201, 1228, 1405, 1434, 1625, 1650, 1861, 1894, 2113, 2148, 2369, 2418, 2665, 2704, 2965, 2988, 3281, 3312, 3613, 3658, 3919, 4008, 4325
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
N. J. A. Sloane, Table of n, a(n) for n = 1..1000
FORMULA
a(n) = (A092098(n) + A331782(n) - 1)/3 = A332376(n)/3.
CROSSREFS
Cf. A091908, A092098 (number of cells), A331782 (number of vertices), A332376.
Sequence in context: A041407 A252976 A065564 * A268720 A191253 A371636
Adjacent sequences: A332374 A332375 A332376 * A332378 A332379 A332380
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 13 2020
STATUS
approved

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Last modified February 26 23:45 EST 2025. Contains 381238 sequences.
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