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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A341734 a(n) = A007678(2*n)/(2*n).

Original entry on oeis.org

0, 1, 4, 10, 22, 37, 68, 106, 137, 225, 310, 376, 538, 685, 716, 1058, 1288, 1471, 1842, 2170, 2327, 2941, 3388, 3734, 4412, 4993, 5444, 6306, 7042, 7391, 8680, 9586, 10289, 11585, 12682, 13628, 15078, 16381, 17440, 19210, 20740, 21899, 24038, 25810, 27245, 29613, 31648, 33418, 35992, 38305
Offset: 1

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Author

Scott R. Shannon and N. J. A. Sloane, Mar 07 2021

Keywords

Comments

This is the number of cells in a 1/(2*n)-th sector of a regular (2*n)-gon with all diagonals drawn. See Rubinstein's illustrations in A007678.

Examples

			If we divide a regular hexagon with all diagonals drawn into 6 sectors (or pizza slices), each sector contains three triangles and one quadrilateral (cf. A331450), so a(3) = A007678(6)/6 = 24/6 = 4.

Links

Crossrefs

Cf. A007678, A331450, A341735.
Row sums of triangle in A342268.
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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