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 | 7 |
| 4 | 17 |
| 5 | 47 |
| 6 | 110 |
| 7 | 250 |
| 8 | 538 |
| 9 | 1123 |
| 10 | 2278 |
| 11 | 4522 |
| 12 | 8812 |
| 13 | 16911 |
| 14 | 32031 |
| 15 | 59991 |
| 16 | 111263 |
| 17 | 204593 |
| 18 | 373370 |
| 19 | 676800 |
| 20 | 1219440 |
| 21 | 2185251 |
| 22 | 3896796 |
| 23 | 6917892 |
| 24 | 12231192 |
| 25 | 21544717 |
| 26 | 37819885 |
| 27 | 66179335 |
| 28 | 115464893 |
| 29 | 200906723 |
| 30 | 348688838 |