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 | 20 |
| 3 | 315 |
| 4 | 2344 |
| 5 | 11165 |
| 6 | 39996 |
| 7 | 117655 |
| 8 | 299600 |
| 9 | 683289 |
| 10 | 1428580 |
| 11 | 2783891 |
| 12 | 5118840 |
| 13 | 8964085 |
| 14 | 15059084 |
| 15 | 24408495 |
| 16 | 38347936 |
| 17 | 58619825 |
| 18 | 87460020 |
| 19 | 127695979 |
| 20 | 182857160 |
| 21 | 257298381 |
| 22 | 356336860 |
| 23 | 486403655 |
| 24 | 655210224 |
| 25 | 871930825 |
| 26 | 1147401476 |
| 27 | 1494336195 |
| 28 | 1927561240 |