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 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 146 |
| 5 | 159 |
| 6 | 305 |
| 7 | 1074 |
| 8 | 2453 |
| 9 | 5980 |
| 10 | 20393 |
| 11 | 26373 |
| 12 | 46766 |
| 13 | 540799 |
| 14 | 2209962 |
| 15 | 4960723 |
| 16 | 7170685 |
| 17 | 248764013 |
| 18 | 255934698 |
| 19 | 760633409 |
| 20 | 3298468334 |
| 21 | 37043785083 |
| 22 | 40342253417 |
| 23 | 77386038500 |
| 24 | 272500368917 |
| 25 | 622386776334 |
| 26 | 1517273921585 |
| 27 | 5174208541089 |
| 28 | 6691482462674 |