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 | 21 |
| 2 | 399 |
| 3 | 8127 |
| 4 | 184436 |
| 5 | 4695719 |
| 6 | 133730310 |
| 7 | 4234560596 |
| 8 | 148077895854 |
| 9 | 5680484146379 |
| 10 | 237574859841676 |
| 11 | 10771591113205720 |
| 12 | 526750324271281348 |
| 13 | 27655229128194306702 |
| 14 | 1552379671658643163707 |
| 15 | 92820542631741826797326 |