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) |
|---|---|
| 3 | 1 |
| 4 | 6 |
| 5 | 10 |
| 6 | 75 |
| 7 | 21 |
| 8 | 476 |
| 9 | 540 |
| 10 | 4185 |
| 11 | 1375 |
| 12 | 47850 |
| 13 | 10374 |
| 14 | 249431 |
| 15 | 395955 |
| 16 | 2572680 |
| 17 | 278392 |
| 18 | 30877389 |
| 19 | 5000211 |
| 20 | 214159070 |
| 21 | 291693150 |
| 22 | 1465649955 |
| 23 | 1224138223 |
| 24 | 23284864476 |
| 25 | 13175039700 |
| 26 | 157019230225 |
| 27 | 198060711381 |
| 28 | 1510657970346 |
| 29 | 1118209769530 |
| 30 | 18176060999625 |