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.

A057712 Number of "polyhes" of order n: a polyhe of order n is obtained by taking a polyhex made of n hexagons (A000228); cutting each of the n hexagons along a diameter and throwing away half that hexagon, in such a way that the remaining figure (made of n half-hexagons) is connected.

Table of values

n a(n)
1 1
2 4
3 13
4 60
5 276
6 1416
7 7201
8 37972
9 201989
10 1089815
11 5929666
12 32533673
13 179657435

List of values

[1, 4, 13, 60, 276, 1416, 7201, 37972, 201989, 1089815, 5929666, 32533673, 179657435]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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