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 | 16 |
| 4 | 92 |
| 5 | 365 |
| 6 | 1204 |
| 7 | 3588 |
| 8 | 10093 |
| 9 | 27476 |
| 10 | 73440 |
| 11 | 194345 |
| 12 | 511576 |
| 13 | 1342936 |
| 14 | 3520457 |
| 15 | 9222440 |
| 16 | 24151764 |
| 17 | 63238773 |
| 18 | 165571628 |
| 19 | 433484476 |
| 20 | 1134891605 |
| 21 | 2971201740 |
| 22 | 7778726776 |