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 | 12 |
| 2 | 126 |
| 3 | 1296 |
| 4 | 13365 |
| 5 | 138996 |
| 6 | 1459458 |
| 7 | 15466464 |
| 8 | 165297834 |
| 9 | 1780130520 |
| 10 | 19301700924 |
| 11 | 210564010080 |
| 12 | 2309623985565 |
| 13 | 25458117777540 |
| 14 | 281857732537050 |
| 15 | 3133071216411840 |
| 16 | 34953325758094590 |
| 17 | 391242268149428520 |
| 18 | 4392583646950402020 |
| 19 | 49454259823789423200 |