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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 5 |
| 4 | 145 |
| 5 | 4901 |
| 6 | 166465 |
| 7 | 5654885 |
| 8 | 192099601 |
| 9 | 6525731525 |
| 10 | 221682772225 |
| 11 | 7530688524101 |
| 12 | 255821727047185 |
| 13 | 8690408031080165 |
| 14 | 295218051329678401 |
| 15 | 10028723337177985445 |
| 16 | 340681375412721826705 |
| 17 | 11573138040695364122501 |
| 18 | 393146012008229658338305 |