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 | 1 |
| 2 | 5 |
| 3 | 22 |
| 4 | 94 |
| 5 | 401 |
| 6 | 1723 |
| 7 | 7475 |
| 8 | 32749 |
| 9 | 144803 |
| 10 | 645627 |
| 11 | 2900256 |
| 12 | 13115820 |
| 13 | 59669295 |
| 14 | 272918415 |
| 15 | 1254314310 |
| 16 | 5789850730 |
| 17 | 26831078075 |
| 18 | 124785337255 |
| 19 | 582247766810 |
| 20 | 2724905891890 |
| 21 | 12787603121195 |
| 22 | 60162698218325 |
| 23 | 283715348775727 |