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 | 1 |
| 2 | 5 |
| 3 | 23 |
| 4 | 167 |
| 5 | 1473 |
| 6 | 16413 |
| 7 | 211479 |
| 8 | 3192975 |
| 9 | 54010305 |
| 10 | 1030249845 |
| 11 | 21566327895 |
| 12 | 497334999735 |
| 13 | 12405876372225 |
| 14 | 335591130336525 |
| 15 | 9716331072597975 |
| 16 | 301633179343890975 |
| 17 | 9941514351641143425 |
| 18 | 348336799875365041125 |