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 | 17 |
| 5 | 38 |
| 6 | 87 |
| 7 | 191 |
| 8 | 421 |
| 9 | 911 |
| 10 | 1963 |
| 11 | 4186 |
| 12 | 8885 |
| 13 | 18724 |
| 14 | 39284 |
| 15 | 82005 |
| 16 | 170521 |
| 17 | 353214 |
| 18 | 729290 |
| 19 | 1501184 |
| 20 | 3081869 |
| 21 | 6311404 |
| 22 | 12896983 |
| 23 | 26301515 |
| 24 | 53541702 |
| 25 | 108815626 |
| 26 | 220824295 |
| 27 | 447524559 |
| 28 | 905850001 |
| 29 | 1831526719 |