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 | 2 |
| 3 | 5 |
| 4 | 12 |
| 5 | 36 |
| 6 | 96 |
| 7 | 311 |
| 8 | 886 |
| 9 | 3000 |
| 10 | 8944 |
| 11 | 31192 |
| 12 | 96138 |
| 13 | 342562 |
| 14 | 1083028 |
| 15 | 3923351 |
| 16 | 12656024 |
| 17 | 46455770 |
| 18 | 152325850 |
| 19 | 565212506 |
| 20 | 1878551444 |
| 21 | 7033866580 |
| 22 | 23645970022 |
| 23 | 89222991344 |
| 24 | 302879546290 |
| 25 | 1150480017950 |
| 26 | 3938480377496 |
| 27 | 15047312553918 |
| 28 | 51892071842570 |
| 29 | 199274492098480 |
| 30 | 691680497233180 |