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 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 7 |
| 5 | 18 |
| 6 | 49 |
| 7 | 120 |
| 8 | 265 |
| 9 | 554 |
| 10 | 1155 |
| 11 | 2476 |
| 12 | 5455 |
| 13 | 12138 |
| 14 | 26881 |
| 15 | 58992 |
| 16 | 128689 |
| 17 | 280466 |
| 18 | 612579 |
| 19 | 1341268 |
| 20 | 2940151 |
| 21 | 6443778 |
| 22 | 14111857 |
| 23 | 30886632 |
| 24 | 67590649 |
| 25 | 147934010 |
| 26 | 323850531 |
| 27 | 709047292 |
| 28 | 1552412671 |
| 29 | 3398703066 |
| 30 | 7440375937 |