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 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 41 |
| 5 | 13 |
| 6 | 8009 |
| 7 | 161 |
| 8 | 190513 |
| 9 | 167101 |
| 10 | 13371157 |
| 11 | 21857 |
| 12 | 316786853 |
| 13 | 371449 |
| 14 | 52598187029 |
| 15 | 260957190289 |
| 16 | 129548894873 |
| 17 | 3562512061 |
| 18 | 295728132584141 |
| 19 | 814542451061 |
| 20 | 105590441859671453 |
| 21 | 21013691164284241 |
| 22 | 2988054680665783 |
| 23 | 5623939943287 |
| 24 | 1567371864703176307 |