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 | 1 |
| 2 | 3 |
| 3 | 20 |
| 4 | 24 |
| 5 | 10 |
| 6 | 30 |
| 7 | 276 |
| 8 | 388 |
| 9 | 81 |
| 10 | 225 |
| 11 | 726 |
| 12 | 2935 |
| 13 | 1408 |
| 14 | 7718 |
| 15 | 5624 |
| 16 | 5680 |
| 17 | 85998 |
| 18 | 26706 |
| 19 | 546290 |
| 20 | 1112929 |
| 21 | 702575 |
| 22 | 3425417 |
| 23 | 10537360 |
| 24 | 21301906 |
| 25 | 217230900 |
| 26 | 108698091 |
| 27 | 32381774 |
| 28 | 846522986 |
| 29 | 851764846 |
| 30 | 11692311325 |
| 31 | 46163898987 |