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 | 2 |
| 3 | 6 |
| 4 | 105 |
| 5 | 284 |
| 6 | 747 |
| 7 | 984 |
| 8 | 2230 |
| 9 | 5377 |
| 10 | 11513 |
| 11 | 15453 |
| 12 | 56611 |
| 13 | 140810 |
| 14 | 1282328 |
| 15 | 2175211 |
| 16 | 3328834 |
| 17 | 96073801 |
| 18 | 285626436 |
| 19 | 801855023 |
| 20 | 927833490 |