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 | 16 |
| 4 | 77 |
| 5 | 538 |
| 6 | 1621 |
| 7 | 2457 |
| 8 | 5291 |
| 9 | 5313 |
| 10 | 52008 |
| 11 | 142401 |
| 12 | 143498 |
| 13 | 1610151 |
| 14 | 1713543 |
| 15 | 4670028 |
| 16 | 5218983 |
| 17 | 15137566 |
| 18 | 15282411 |
| 19 | 15814148 |
| 20 | 47370058 |
| 21 | 50702751 |
| 22 | 142594226 |
| 23 | 166691108 |
| 24 | 1694576061 |
| 25 | 2554554552 |
| 26 | 25541432472 |
| 27 | 47878213558 |
| 28 | 77714915542 |
| 29 | 155482156418 |