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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 17 |
| 5 | 49 |
| 6 | 153 |
| 7 | 281 |
| 8 | 665 |
| 9 | 1433 |
| 10 | 3225 |
| 11 | 7705 |
| 12 | 17945 |
| 13 | 47641 |
| 14 | 64025 |
| 15 | 129561 |
| 16 | 293401 |
| 17 | 752153 |
| 18 | 1341977 |
| 19 | 2914841 |
| 20 | 6421017 |
| 21 | 14547481 |
| 22 | 33421849 |
| 23 | 71170585 |
| 24 | 138279449 |
| 25 | 247331353 |
| 26 | 645790233 |
| 27 | 1182661145 |
| 28 | 2558392857 |
| 29 | 5779618329 |
| 30 | 11685198361 |
| 31 | 23496358425 |