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 | 7 |
| 3 | 46 |
| 4 | 265 |
| 5 | 1519 |
| 6 | 8560 |
| 7 | 47578 |
| 8 | 264076 |
| 9 | 1461439 |
| 10 | 8075011 |
| 11 | 44596708 |
| 12 | 246189961 |
| 13 | 1358762089 |
| 14 | 7498499272 |
| 15 | 41378660380 |
| 16 | 228330571360 |
| 17 | 1259923712821 |
| 18 | 6952163820391 |
| 19 | 38361311420962 |
| 20 | 211673092313329 |
| 21 | 1167984733037851 |
| 22 | 6444783128779528 |
| 23 | 35561432547881926 |