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 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 33 |
| 5 | 88 |
| 6 | 254 |
| 7 | 697 |
| 8 | 1984 |
| 9 | 5585 |
| 10 | 15938 |
| 11 | 45424 |
| 12 | 130381 |
| 13 | 374450 |
| 14 | 1079361 |
| 15 | 3115291 |
| 16 | 9010177 |
| 17 | 26090857 |
| 18 | 75656608 |
| 19 | 219603868 |
| 20 | 638075127 |
| 21 | 1855506355 |
| 22 | 5399995044 |
| 23 | 15726096741 |
| 24 | 45827313178 |
| 25 | 133621409595 |
| 26 | 389814176004 |
| 27 | 1137757623214 |
| 28 | 3322288247568 |
| 29 | 9705228070231 |
| 30 | 26283373417131 |