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) |
|---|---|
| 0 | -1 |
| 1 | 0 |
| 2 | 21 |
| 3 | 182 |
| 4 | 819 |
| 5 | 2604 |
| 6 | 6665 |
| 7 | 14706 |
| 8 | 29127 |
| 9 | 53144 |
| 10 | 90909 |
| 11 | 147630 |
| 12 | 229691 |
| 13 | 344772 |
| 14 | 501969 |
| 15 | 711914 |
| 16 | 986895 |
| 17 | 1340976 |
| 18 | 1790117 |
| 19 | 2352294 |
| 20 | 3047619 |
| 21 | 3898460 |
| 22 | 4929561 |
| 23 | 6168162 |
| 24 | 7644119 |
| 25 | 9390024 |
| 26 | 11441325 |
| 27 | 13836446 |
| 28 | 16616907 |
| 29 | 19827444 |
| 30 | 23516129 |
| 31 | 27734490 |
| 32 | 32537631 |
| 33 | 37984352 |
| 34 | 44137269 |