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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.

A002215 Number of polyhexes with n hexagons, having reflectional symmetry (see Harary and Read for precise definition).

Table of values

n a(n)
1 1
2 1
3 2
4 3
5 6
6 10
7 20
8 36
9 72
10 137
11 274
12 543
13 1086
14 2219
15 4438
16 9285
17 18570
18 39587
19 79174
20 171369
21 342738
22 751236
23 1502472
24 3328218
25 6656436
26 14878455
27 29756910
28 67030785
29 134061570
30 304036170
31 608072340
32 1387247580
33 2774495160

List of values

[1, 1, 2, 3, 6, 10, 20, 36, 72, 137, 274, 543, 1086, 2219, 4438, 9285, 18570, 39587, 79174, 171369, 342738, 751236, 1502472, 3328218, 6656436, 14878455, 29756910, 67030785, 134061570, 304036170, 608072340, 1387247580, 2774495160]

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

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