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 | 2 |
| 1 | 4 |
| 2 | 4 |
| 3 | 15 |
| 4 | 17 |
| 5 | 77 |
| 6 | 101 |
| 7 | 119 |
| 8 | 143 |
| 9 | 250 |
| 10 | 362 |
| 11 | 1401 |
| 12 | 31168 |
| 13 | 88629 |
| 14 | 184654 |
| 15 | 259251 |
| 16 | 298769 |
| 17 | 4196069 |
| 18 | 38538873 |
| 19 | 616984562 |
| 20 | 1975413034 |
| 21 | 5345718056 |
| 22 | 27843871196 |
| 23 | 54516286512 |
| 24 | 334398528973 |
| 25 | 445879679625 |
| 26 | 495957494385 |
| 27 | 2450869042060 |
| 28 | 2629541150528 |
| 29 | 4088114099884 |