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 | 1 |
| 4 | 2 |
| 5 | 6 |
| 6 | 16 |
| 7 | 37 |
| 8 | 83 |
| 9 | 199 |
| 10 | 512 |
| 11 | 1343 |
| 12 | 3488 |
| 13 | 9011 |
| 14 | 23488 |
| 15 | 62094 |
| 16 | 165738 |
| 17 | 444160 |
| 18 | 1193146 |
| 19 | 3216436 |
| 20 | 8709766 |
| 21 | 23683846 |
| 22 | 64611879 |
| 23 | 176730460 |
| 24 | 484593740 |
| 25 | 1332018207 |
| 26 | 3669981318 |
| 27 | 10133197561 |
| 28 | 28032766982 |
| 29 | 77688769031 |
| 30 | 215665451243 |
| 31 | 599644845226 |