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) |
|---|---|
| 6 | 1 |
| 7 | 17 |
| 8 | 145 |
| 9 | 836 |
| 10 | 3846 |
| 11 | 15002 |
| 12 | 52132 |
| 13 | 164576 |
| 14 | 484609 |
| 15 | 1337597 |
| 16 | 3521517 |
| 17 | 8850458 |
| 18 | 21485321 |
| 19 | 50358968 |
| 20 | 114911640 |
| 21 | 255114977 |
| 22 | 554333346 |
| 23 | 1178070741 |
| 24 | 2459840199 |
| 25 | 5042845917 |
| 26 | 10185374250 |
| 27 | 20257833206 |
| 28 | 39778823250 |
| 29 | 77088115856 |
| 30 | 147739793527 |
| 31 | 279923493220 |