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 | 6 |
| 3 | 42 |
| 4 | 27 |
| 5 | 480 |
| 6 | 265 |
| 7 | 7070 |
| 8 | 3815 |
| 9 | 1820 |
| 10 | 1449 |
| 11 | 107338 |
| 12 | 56903 |
| 13 | 4636632 |
| 14 | 2635061 |
| 15 | 993850 |
| 16 | 633919 |
| 17 | 71014372 |
| 18 | 42899857 |
| 19 | 8111619802 |
| 20 | 4675943415 |
| 21 | 1414861448 |
| 22 | 819657397 |
| 23 | 113827776894 |
| 24 | 75106291091 |
| 25 | 41292848428 |