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) |
|---|---|
| 7 | 3 |
| 8 | 40 |
| 9 | 318 |
| 10 | 1974 |
| 11 | 10603 |
| 12 | 51894 |
| 13 | 238413 |
| 14 | 1047440 |
| 15 | 4454826 |
| 16 | 18496217 |
| 17 | 75416600 |
| 18 | 303287250 |
| 19 | 1206781482 |
| 20 | 4762466651 |
| 21 | 18674965709 |
| 22 | 72866587238 |
| 23 | 283217927396 |
| 24 | 1097537249485 |
| 25 | 4243554109115 |
| 26 | 16379413110981 |
| 27 | 63142882465324 |
| 28 | 243203630272390 |