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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 10 |
| 11 | 1210 |
| 12 | 27198 |
| 13 | 322782 |
| 14 | 2564988 |
| 15 | 15372702 |
| 16 | 74615814 |
| 17 | 306900410 |
| 18 | 1105651074 |
| 19 | 3569169990 |
| 20 | 10512880400 |
| 21 | 28628691842 |
| 22 | 72880455042 |
| 23 | 174895586328 |
| 24 | 398556484840 |
| 25 | 867314768878 |
| 26 | 1811576604968 |
| 27 | 3646385889888 |