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 | 18 |
| 3 | 101 |
| 4 | 392 |
| 5 | 1119 |
| 6 | 2904 |
| 7 | 6407 |
| 8 | 13578 |
| 9 | 26218 |
| 10 | 49218 |
| 11 | 86782 |
| 12 | 150860 |
| 13 | 249723 |
| 14 | 408810 |
| 15 | 647170 |
| 16 | 1013278 |
| 17 | 1545029 |
| 18 | 2337738 |
| 19 | 3460218 |
| 20 | 5086658 |
| 21 | 7350874 |
| 22 | 10549872 |
| 23 | 14929931 |
| 24 | 21009874 |
| 25 | 29205500 |
| 26 | 40385036 |
| 27 | 55289000 |
| 28 | 75309056 |
| 29 | 101692923 |
| 30 | 136710130 |
| 31 | 182377824 |