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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 6 |
| 4 | 16 |
| 5 | 56 |
| 6 | 71 |
| 7 | 252 |
| 8 | 296 |
| 9 | 651 |
| 10 | 721 |
| 11 | 2002 |
| 12 | 1282 |
| 13 | 4368 |
| 14 | 3402 |
| 15 | 5782 |
| 16 | 6672 |
| 17 | 15504 |
| 18 | 7947 |
| 19 | 26334 |
| 20 | 15702 |
| 21 | 28868 |
| 22 | 28457 |
| 23 | 65780 |
| 24 | 30212 |
| 25 | 85580 |
| 26 | 63063 |
| 27 | 103284 |
| 28 | 81452 |
| 29 | 201376 |
| 30 | 66102 |
| 31 | 278256 |
| 32 | 174624 |
| 33 | 255794 |
| 34 | 228684 |
| 35 | 383166 |
| 36 | 206838 |
| 37 | 658008 |
| 38 | 391419 |
| 39 | 576394 |
| 40 | 413244 |
| 41 | 1086008 |