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 | 15 |
| 1 | 545 |
| 2 | 7043 |
| 3 | 57560 |
| 4 | 365045 |
| 5 | 1970905 |
| 6 | 9520315 |
| 7 | 42385132 |
| 8 | 177293730 |
| 9 | 705980760 |
| 10 | 2701362950 |
| 11 | 10001654350 |
| 12 | 36020160943 |
| 13 | 126701700755 |
| 14 | 436709397085 |
| 15 | 1478813477920 |
| 16 | 4930328078835 |
| 17 | 16212542696607 |