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 | 6 |
| 1 | 1 |
| 2 | 31 |
| 3 | 136 |
| 4 | 731 |
| 5 | 3771 |
| 6 | 19606 |
| 7 | 101781 |
| 8 | 528531 |
| 9 | 2744416 |
| 10 | 14250631 |
| 11 | 73997551 |
| 12 | 384238406 |
| 13 | 1995189561 |
| 14 | 10360186231 |
| 15 | 53796120696 |
| 16 | 279340789731 |
| 17 | 1450500069331 |
| 18 | 7531841136406 |
| 19 | 39109705751341 |
| 20 | 203080369893131 |
| 21 | 1054511555216976 |
| 22 | 5475638145978031 |
| 23 | 28432702285107111 |