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 | 3 |
| 3 | 7 |
| 4 | 19 |
| 5 | 46 |
| 6 | 132 |
| 7 | 345 |
| 8 | 951 |
| 9 | 2457 |
| 10 | 6198 |
| 11 | 14816 |
| 12 | 34126 |
| 13 | 75057 |
| 14 | 159176 |
| 15 | 325021 |
| 16 | 642473 |
| 17 | 1230711 |
| 18 | 2292826 |
| 19 | 4160165 |
| 20 | 7370620 |
| 21 | 12768904 |
| 22 | 21671722 |
| 23 | 36080204 |
| 24 | 59009291 |
| 25 | 94910598 |
| 26 | 150300578 |
| 27 | 234560237 |
| 28 | 361082376 |
| 29 | 548722631 |
| 30 | 823817750 |