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 | 1 |
| 4 | 1 |
| 5 | 6 |
| 6 | 31 |
| 7 | 106 |
| 8 | 281 |
| 9 | 1261 |
| 10 | 10711 |
| 11 | 71611 |
| 12 | 350461 |
| 13 | 1808236 |
| 14 | 17037021 |
| 15 | 170285116 |
| 16 | 1293714241 |
| 17 | 8653175441 |
| 18 | 84433291741 |
| 19 | 1063629264781 |
| 20 | 11218379358721 |
| 21 | 97926941650546 |
| 22 | 1021280770603171 |
| 23 | 14623420493573046 |
| 24 | 197153396050112041 |
| 25 | 2190425085571083901 |