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.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 14 |
| 6 | 38 |
| 7 | 120 |
| 8 | 353 |
| 9 | 1148 |
| 10 | 3527 |
| 11 | 11622 |
| 12 | 36627 |
| 13 | 121622 |
| 14 | 389560 |
| 15 | 1301140 |
| 16 | 4215748 |
| 17 | 14146335 |
| 18 | 46235800 |
| 19 | 155741571 |
| 20 | 512559195 |
| 21 | 1732007938 |
| 22 | 5732533570 |
| 23 | 19423092113 |
| 24 | 64590165281 |
| 25 | 219349187968 |
| 26 | 732358098471 |
| 27 | 2492051377341 |
| 28 | 8349072895553 |
| 29 | 28459491475593 |