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 | 0 |
| 1 | 0 |
| 2 | 17 |
| 3 | 279 |
| 4 | 1960 |
| 5 | 8875 |
| 6 | 30555 |
| 7 | 87122 |
| 8 | 216384 |
| 9 | 483570 |
| 10 | 994125 |
| 11 | 1909985 |
| 12 | 3469752 |
| 13 | 6013189 |
| 14 | 10010455 |
| 15 | 16096500 |
| 16 | 25111040 |
| 17 | 38144532 |
| 18 | 56590569 |
| 19 | 82205115 |
| 20 | 117173000 |
| 21 | 164182095 |
| 22 | 226505587 |
| 23 | 308092774 |
| 24 | 413668800 |
| 25 | 548843750 |
| 26 | 720231525 |
| 27 | 935578917 |
| 28 | 1203905304 |