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 | 1 |
| 2 | 23 |
| 3 | 397 |
| 4 | 6095 |
| 5 | 87781 |
| 6 | 1214423 |
| 7 | 16344637 |
| 8 | 215622815 |
| 9 | 2801832661 |
| 10 | 35979939623 |
| 11 | 457696700077 |
| 12 | 5777672071535 |
| 13 | 72470493235141 |
| 14 | 904168630965623 |
| 15 | 11229773405170717 |
| 16 | 138934529031464255 |
| 17 | 1713164078241143221 |