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 | 5 |
| 3 | 15 |
| 4 | 39 |
| 5 | 97 |
| 6 | 237 |
| 7 | 575 |
| 8 | 1391 |
| 9 | 3361 |
| 10 | 8117 |
| 11 | 19599 |
| 12 | 47319 |
| 13 | 114241 |
| 14 | 275805 |
| 15 | 665855 |
| 16 | 1607519 |
| 17 | 3880897 |
| 18 | 9369317 |
| 19 | 22619535 |
| 20 | 54608391 |
| 21 | 131836321 |
| 22 | 318281037 |
| 23 | 768398399 |
| 24 | 1855077839 |
| 25 | 4478554081 |
| 26 | 10812186005 |
| 27 | 26102926095 |
| 28 | 63018038199 |
| 29 | 152139002497 |
| 30 | 367296043197 |