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 | 4 |
| 2 | 17 |
| 3 | 75 |
| 4 | 338 |
| 5 | 1541 |
| 6 | 7069 |
| 7 | 32532 |
| 8 | 149965 |
| 9 | 691903 |
| 10 | 3193706 |
| 11 | 14745009 |
| 12 | 68084297 |
| 13 | 314394980 |
| 14 | 1451837593 |
| 15 | 6704518371 |
| 16 | 30961415074 |
| 17 | 142980203437 |
| 18 | 660285858245 |
| 19 | 3049218769908 |
| 20 | 14081386948661 |
| 21 | 65028302171639 |
| 22 | 300302858766202 |
| 23 | 1386808687475385 |
| 24 | 6404329365899473 |