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 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 6 |
| 7 | 11 |
| 8 | 23 |
| 9 | 47 |
| 10 | 105 |
| 11 | 231 |
| 12 | 532 |
| 13 | 1254 |
| 14 | 2872 |
| 15 | 6739 |
| 16 | 15955 |
| 17 | 37776 |
| 18 | 89779 |
| 19 | 213381 |
| 20 | 507949 |
| 21 | 1209184 |
| 22 | 2880382 |
| 23 | 6861351 |
| 24 | 16348887 |
| 25 | 38955354 |