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 | 4 |
| 4 | 10 |
| 5 | 16 |
| 6 | 30 |
| 7 | 103 |
| 8 | 210 |
| 9 | 261 |
| 10 | 1625 |
| 11 | 3081 |
| 12 | 6693 |
| 13 | 32697 |
| 14 | 155165 |
| 15 | 262546 |
| 16 | 697924 |
| 17 | 760750 |
| 18 | 1081782 |
| 19 | 5547049 |
| 20 | 14637837 |
| 21 | 18044997 |