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 | 1 |
| 2 | 15 |
| 3 | 246 |
| 4 | 4810 |
| 5 | 111315 |
| 6 | 2994621 |
| 7 | 92069740 |
| 8 | 3188772756 |
| 9 | 122934101445 |
| 10 | 5223324100555 |
| 11 | 242563221769506 |
| 12 | 12224586738476190 |
| 13 | 664572113979550231 |
| 14 | 38767776344788218105 |
| 15 | 2415639337342677314520 |
| 16 | 160131212043826343202856 |