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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 23 |
| 5 | 104 |
| 6 | 533 |
| 7 | 3038 |
| 8 | 19128 |
| 9 | 133112 |
| 10 | 1028287 |
| 11 | 8859284 |
| 12 | 85298231 |
| 13 | 915617310 |
| 14 | 10887682031 |
| 15 | 142169785210 |