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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 1060 |
| 6 | 2137 |
| 7 | 3197 |
| 8 | 3214 |
| 9 | 3217 |
| 10 | 3337 |
| 11 | 313259 |
| 12 | 313406 |
| 13 | 730473 |
| 14 | 2304689 |
| 15 | 2416087 |
| 16 | 3579260 |
| 17 | 28850251 |
| 18 | 31289731 |
| 19 | 132716102 |
| 20 | 206771980 |
| 21 | 530864408 |
| 22 | 616417140 |
| 23 | 621776006 |
| 24 | 1553684761 |
| 25 | 2123457632 |
| 26 | 2232402380 |
| 27 | 5264756497 |
| 28 | 8929609520 |
| 29 | 22137774186 |
| 30 | 2543308829640 |