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) |
|---|---|
| 9 | 1 |
| 10 | 18 |
| 11 | 164 |
| 12 | 1050 |
| 13 | 5367 |
| 14 | 23232 |
| 15 | 88125 |
| 16 | 299992 |
| 17 | 932849 |
| 18 | 2685747 |
| 19 | 7235237 |
| 20 | 18392853 |
| 21 | 44427807 |
| 22 | 102552852 |
| 23 | 227298680 |
| 24 | 485679518 |
| 25 | 1003915611 |
| 26 | 2013360324 |
| 27 | 3927664296 |
| 28 | 7469755903 |
| 29 | 13876848040 |
| 30 | 25225619858 |
| 31 | 44939663514 |
| 32 | 78569415198 |
| 33 | 134974052794 |
| 34 | 228088973049 |