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 | 1 |
| 3 | 3 |
| 4 | 4 |
| 5 | 25 |
| 6 | 6 |
| 7 | 49 |
| 8 | 176 |
| 9 | 621 |
| 10 | 100 |
| 11 | 7381 |
| 12 | 552 |
| 13 | 86021 |
| 14 | 11662 |
| 15 | 18075 |
| 16 | 91072 |
| 17 | 2436559 |
| 18 | 133542 |
| 19 | 14274301 |
| 20 | 5431600 |
| 21 | 9484587 |
| 22 | 2764366 |
| 23 | 19093197 |
| 24 | 61931424 |
| 25 | 399698125 |
| 26 | 281538452 |
| 27 | 8770427199 |
| 28 | 1513702904 |
| 29 | 315404588903 |
| 30 | 323507400 |
| 31 | 9304682830147 |