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 | 3 |
| 2 | 9 |
| 3 | 7 |
| 4 | 17 |
| 5 | 31 |
| 6 | 57 |
| 7 | 111 |
| 8 | 265 |
| 9 | 527 |
| 10 | 1065 |
| 11 | 2431 |
| 12 | 4953 |
| 13 | 10095 |
| 14 | 22537 |
| 15 | 46527 |
| 16 | 95417 |
| 17 | 209679 |
| 18 | 436585 |
| 19 | 900191 |
| 20 | 1955353 |
| 21 | 4093999 |
| 22 | 8480457 |
| 23 | 18265087 |
| 24 | 38377337 |
| 25 | 79802575 |
| 26 | 170819881 |
| 27 | 359693471 |
| 28 | 750304217 |
| 29 | 1598909295 |
| 30 | 3371088777 |
| 31 | 7049660735 |