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 | 2 |
| 2 | 5 |
| 3 | 22 |
| 4 | 113 |
| 5 | 746 |
| 6 | 6037 |
| 7 | 55070 |
| 8 | 548417 |
| 9 | 6281938 |
| 10 | 79935941 |
| 11 | 1087584422 |
| 12 | 16109401585 |
| 13 | 255667890362 |
| 14 | 4358283982613 |
| 15 | 79893373511086 |
| 16 | 1542859916102657 |
| 17 | 31322024816838050 |
| 18 | 676027617881188357 |
| 19 | 15287136167625123638 |
| 20 | 362322855217463741681 |