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 | 2 |
| 2 | 9 |
| 3 | 40 |
| 4 | 484 |
| 5 | 9717 |
| 6 | 338724 |
| 7 | 21624680 |
| 8 | 2504301849 |
| 9 | 520443847520 |
| 10 | 195145309791364 |
| 11 | 131850659243316222 |
| 12 | 160668896658179472676 |
| 13 | 352891729183598844656996 |
| 14 | 1397187513066371784602204416 |
| 15 | 9972288382286063615850619475640 |