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 | 0 |
| 1 | 7 |
| 2 | 29 |
| 3 | 114 |
| 4 | 971 |
| 5 | 3695 |
| 6 | 14684 |
| 7 | 58639 |
| 8 | 496705 |
| 9 | 1892294 |
| 10 | 7518347 |
| 11 | 30023387 |
| 12 | 258775984 |
| 13 | 966632223 |
| 14 | 3848859285 |
| 15 | 32551146626 |
| 16 | 123937019667 |
| 17 | 492763242871 |
| 18 | 1967451434524 |
| 19 | 16666715013959 |
| 20 | 63494909959113 |