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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 11 |
| 6 | 25 |
| 7 | 64 |
| 8 | 169 |
| 9 | 442 |
| 10 | 1172 |
| 11 | 3180 |
| 12 | 8730 |
| 13 | 24116 |
| 14 | 67159 |
| 15 | 188568 |
| 16 | 532741 |
| 17 | 1512695 |
| 18 | 4315996 |
| 19 | 12369324 |
| 20 | 35587923 |
| 21 | 102747636 |
| 22 | 297601382 |
| 23 | 864525312 |
| 24 | 2518185362 |
| 25 | 7353088206 |
| 26 | 21520084301 |
| 27 | 63115752910 |
| 28 | 185474840912 |
| 29 | 546042990300 |
| 30 | 1610314638958 |