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 | 1 |
| 3 | 7 |
| 4 | 25 |
| 5 | 50 |
| 6 | 155 |
| 7 | 508 |
| 8 | 1343 |
| 9 | 3800 |
| 10 | 11438 |
| 11 | 32525 |
| 12 | 92333 |
| 13 | 268766 |
| 14 | 774302 |
| 15 | 2216976 |
| 16 | 6392865 |
| 17 | 18425916 |
| 18 | 52958070 |
| 19 | 152425812 |
| 20 | 438973764 |
| 21 | 1263109849 |
| 22 | 3634965137 |
| 23 | 10463959311 |
| 24 | 30116734921 |
| 25 | 86675829307 |
| 26 | 249478723992 |
| 27 | 718056248229 |
| 28 | 2066658063664 |
| 29 | 5948257601097 |