cp's OEIS Frontend

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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A176357 Partial sums of A036403.

Original entry on oeis.org

1, 127, 4054, 37210, 134325, 776241, 1313848, 5536128, 7280823, 28243653, 32246894, 74873810
Offset: 1

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Author

Jonathan Vos Post, Apr 15 2010

Keywords

Comments

Partial sums of number of equilateral triangles whose vertices (whether connected by lines or not) lie at intersection points resulting from drawing lines connecting every pair of vertices of a regular 3n-gon (and extending beyond the polygon).

Examples

			a(4) = 1 + 126 + 3927 + 33156 = 37210 = 2 * 5 * 61^2.

Crossrefs

Cf. A006600, A036403.

Formula

a(n) = Sum_{i=1..n} A036403(i).
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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