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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.

A005508 Number of unrooted triangulations with reflection symmetry of a disk with one internal node and n+3 nodes on the boundary.

Table of values

n a(n)
0 1
1 2
2 3
3 6
4 8
5 18
6 23
7 56
8 70
9 180
10 222
11 594
12 726
13 2002
14 2431
15 6864
16 8294
17 23868
18 28730
19 83980
20 100776
21 298452
22 357238
23 1069776
24 1277788
25 3863080
26 4605980
27 14040810
28 16715250
29 51325650
30 61020495
31 188574240
32 223931910
33 695987820
34 825632610
35 2579248980

List of values

[1, 2, 3, 6, 8, 18, 23, 56, 70, 180, 222, 594, 726, 2002, 2431, 6864, 8294, 23868, 28730, 83980, 100776, 298452, 357238, 1069776, 1277788, 3863080, 4605980, 14040810, 16715250, 51325650, 61020495, 188574240, 223931910, 695987820, 825632610, 2579248980]

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

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