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 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 23 |
| 5 | 68 |
| 6 | 234 |
| 7 | 935 |
| 8 | 4313 |
| 9 | 22794 |
| 10 | 136851 |
| 11 | 925272 |
| 12 | 6985389 |
| 13 | 58417589 |
| 14 | 537217862 |
| 15 | 5396822876 |
| 16 | 58872576894 |
| 17 | 693533824034 |
| 18 | 8773792493050 |
| 19 | 118464612577309 |
| 20 | 1694805159152944 |
| 21 | 25478007021649650 |
| 22 | 398912310757588476 |