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 | 3 |
| 5 | 14 |
| 6 | 33 |
| 7 | 57 |
| 8 | 236 |
| 9 | 6280 |
| 10 | 7170 |
| 11 | 172302 |
| 12 | 24568434 |
| 13 | 32871132 |
| 14 | 43231756 |
| 15 | 60680523 |
| 16 | 83128444 |
| 17 | 720494727 |
| 18 | 803406064 |
| 19 | 1804216488 |
| 20 | 6655647717 |
| 21 | 9106036988 |
| 22 | 14962799365 |
| 23 | 37839117297 |
| 24 | 121819278396 |
| 25 | 262108609568 |