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 | 9 |
| 2 | 37 |
| 3 | 597 |
| 4 | 2395 |
| 5 | 19181 |
| 6 | 76757 |
| 7 | 2456653 |
| 8 | 9827327 |
| 9 | 78621047 |
| 10 | 314488387 |
| 11 | 5031843585 |
| 12 | 20127426343 |
| 13 | 161019596469 |
| 14 | 644078720181 |
| 15 | 41221047786429 |
| 16 | 164884208824551 |
| 17 | 1319073735418803 |
| 18 | 5276295061084887 |
| 19 | 84420721860989787 |