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 | 3 |
| 4 | 11 |
| 5 | 30 |
| 6 | 137 |
| 7 | 606 |
| 8 | 3243 |
| 9 | 17681 |
| 10 | 101718 |
| 11 | 593931 |
| 12 | 3532385 |
| 13 | 21220273 |
| 14 | 128680158 |
| 15 | 785895888 |
| 16 | 4830179751 |
| 17 | 29847223514 |