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) |
|---|---|
| 2 | 1 |
| 3 | 10 |
| 4 | 69 |
| 5 | 340 |
| 6 | 1476 |
| 7 | 6074 |
| 8 | 24419 |
| 9 | 97136 |
| 10 | 384428 |
| 11 | 1517422 |
| 12 | 5981070 |
| 13 | 23556746 |
| 14 | 92743296 |
| 15 | 365078146 |
| 16 | 1437124303 |
| 17 | 5657887016 |
| 18 | 22279053380 |
| 19 | 87749051950 |
| 20 | 345704345066 |
| 21 | 1362361338578 |
| 22 | 5370436417996 |
| 23 | 21176724230654 |
| 24 | 83529562154498 |
| 25 | 329573910914930 |
| 26 | 1300752571946396 |