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 | 18 |
| 2 | 647 |
| 3 | 23274 |
| 4 | 837217 |
| 5 | 30116538 |
| 6 | 1083358151 |
| 7 | 38970776898 |
| 8 | 1401864610177 |
| 9 | 50428155189474 |
| 10 | 1814011722210887 |
| 11 | 65253993844402458 |
| 12 | 2347329766676277601 |
| 13 | 84438617606501591178 |
| 14 | 3037442904067381004807 |
| 15 | 109263505928819214581874 |