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 | 2 |
| 2 | 7 |
| 3 | 5 |
| 4 | 30 |
| 5 | 169 |
| 6 | 441 |
| 7 | 1872 |
| 8 | 7632 |
| 9 | 1740 |
| 10 | 93313 |
| 11 | 459901 |
| 12 | 1358657 |
| 13 | 2504881 |
| 14 | 13482720 |
| 15 | 25779600 |
| 16 | 68468401 |
| 17 | 610346880 |
| 18 | 1271932200 |
| 19 | 327280800 |
| 20 | 11605393800 |
| 21 | 10071626400 |
| 22 | 270022896000 |
| 23 | 212719197601 |
| 24 | 673534461600 |
| 25 | 80276676481 |
| 26 | 7618206526561 |
| 27 | 14227357636801 |