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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 21 |
| 5 | 46 |
| 6 | 55 |
| 7 | 66 |
| 8 | 91 |
| 9 | 574 |
| 10 | 1362 |
| 11 | 1419 |
| 12 | 1654 |
| 13 | 3497 |
| 14 | 4607 |
| 15 | 5263 |
| 16 | 6463 |
| 17 | 430261 |
| 18 | 545869 |
| 19 | 554111 |
| 20 | 567583 |
| 21 | 574823 |
| 22 | 589843 |
| 23 | 8781429 |
| 24 | 14635735 |
| 25 | 20490043 |