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 | 25 |
| 3 | 294 |
| 4 | 2090 |
| 5 | 10460 |
| 6 | 40677 |
| 7 | 131131 |
| 8 | 366088 |
| 9 | 912519 |
| 10 | 2075965 |
| 11 | 4381168 |
| 12 | 8683962 |
| 13 | 16321682 |
| 14 | 29310113 |
| 15 | 50595765 |
| 16 | 84373024 |
| 17 | 136476493 |
| 18 | 214859601 |
| 19 | 330171322 |
| 20 | 496443610 |
| 21 | 731902920 |
| 22 | 1059919949 |
| 23 | 1510112495 |
| 24 | 2119617096 |
| 25 | 2934545875 |
| 26 | 4011645781 |
| 27 | 5420178180 |