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 | 1 |
| 2 | 6 |
| 3 | 71 |
| 4 | 1456 |
| 5 | 45541 |
| 6 | 2020656 |
| 7 | 120686411 |
| 8 | 9336345856 |
| 9 | 908138776681 |
| 10 | 108480272749056 |
| 11 | 15611712012050351 |
| 12 | 2664103110372192256 |
| 13 | 531909061958526321421 |
| 14 | 122840808510269863827456 |
| 15 | 32491881630252866646683891 |
| 16 | 9758611490955498257378246656 |