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 | 0 |
| 1 | 9 |
| 2 | 360 |
| 3 | 13689 |
| 4 | 519840 |
| 5 | 19740249 |
| 6 | 749609640 |
| 7 | 28465426089 |
| 8 | 1080936581760 |
| 9 | 41047124680809 |
| 10 | 1558709801289000 |
| 11 | 59189925324301209 |
| 12 | 2247658452522156960 |
| 13 | 85351831270517663289 |
| 14 | 3241121929827149048040 |
| 15 | 123077281502161146162249 |