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 | 5 |
| 2 | 121 |
| 3 | 1845 |
| 4 | 32000 |
| 5 | 535229 |
| 6 | 9049169 |
| 7 | 152526845 |
| 8 | 2573281769 |
| 9 | 43402320448 |
| 10 | 732106008249 |
| 11 | 12348802743437 |
| 12 | 208295014563521 |
| 13 | 3513435627771565 |
| 14 | 59263242055245056 |
| 15 | 999628735946792581 |
| 16 | 16861339891166667849 |
| 17 | 284410369641222811445 |
| 18 | 4797320930581855672689 |