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 | 2 |
| 2 | 5 |
| 3 | 30 |
| 4 | 38 |
| 5 | 201 |
| 6 | 242 |
| 7 | 689 |
| 8 | 1806 |
| 9 | 7175 |
| 10 | 10839 |
| 11 | 21474 |
| 12 | 64607 |
| 13 | 290563 |
| 14 | 290579 |
| 15 | 581260 |
| 16 | 872576 |
| 17 | 2617577 |
| 18 | 5238258 |
| 19 | 7858320 |
| 20 | 19886365 |
| 21 | 47140605 |
| 22 | 70713773 |
| 23 | 212133736 |