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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 14 |
| 5 | 31 |
| 6 | 138 |
| 7 | 997 |
| 8 | 1135 |
| 9 | 5537 |
| 10 | 12209 |
| 11 | 42164 |
| 12 | 180865 |
| 13 | 1850814 |
| 14 | 2031679 |
| 15 | 5914172 |
| 16 | 7945851 |
| 17 | 13860023 |
| 18 | 21805874 |
| 19 | 340948133 |
| 20 | 362754007 |
| 21 | 1429210154 |
| 22 | 8938014931 |
| 23 | 10367225085 |
| 24 | 19305240016 |
| 25 | 48977705117 |
| 26 | 68282945133 |
| 27 | 117260650250 |
| 28 | 185543595383 |
| 29 | 488347841016 |