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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 97 |
| 4 | 956 |
| 5 | 4780 |
| 6 | 16745 |
| 7 | 46921 |
| 8 | 112672 |
| 9 | 241536 |
| 10 | 474585 |
| 11 | 870265 |
| 12 | 1508716 |
| 13 | 2496572 |
| 14 | 3972241 |
| 15 | 6111665 |
| 16 | 9134560 |
| 17 | 13311136 |
| 18 | 18969297 |
| 19 | 26502321 |
| 20 | 36377020 |
| 21 | 49142380 |
| 22 | 65438681 |
| 23 | 86007097 |
| 24 | 111699776 |
| 25 | 143490400 |
| 26 | 182485225 |
| 27 | 229934601 |