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 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 11 |
| 6 | 31 |
| 7 | 106 |
| 8 | 337 |
| 9 | 1205 |
| 10 | 5021 |
| 11 | 20186 |
| 12 | 86461 |
| 13 | 417847 |
| 14 | 1992355 |
| 15 | 9860306 |
| 16 | 53734241 |
| 17 | 292816841 |
| 18 | 1633818457 |
| 19 | 9855157330 |
| 20 | 59926837141 |
| 21 | 370352343971 |
| 22 | 2439935383271 |
| 23 | 16283034762842 |
| 24 | 109982177787505 |
| 25 | 783404343570301 |
| 26 | 5668314772422901 |
| 27 | 41412522553362026 |