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 | 6 |
| 2 | 46 |
| 3 | 336 |
| 4 | 2386 |
| 5 | 16776 |
| 6 | 117586 |
| 7 | 823416 |
| 8 | 5764546 |
| 9 | 40353096 |
| 10 | 282474226 |
| 11 | 1977324696 |
| 12 | 13841283106 |
| 13 | 96889002216 |
| 14 | 678223056466 |
| 15 | 4747561477176 |
| 16 | 33232930504066 |
| 17 | 232630513856136 |
| 18 | 1628413597648306 |
| 19 | 11398895184848856 |