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 | 5 |
| 2 | 34 |
| 3 | 233 |
| 4 | 1597 |
| 5 | 10946 |
| 6 | 75025 |
| 7 | 514229 |
| 8 | 3524578 |
| 9 | 24157817 |
| 10 | 165580141 |
| 11 | 1134903170 |
| 12 | 7778742049 |
| 13 | 53316291173 |
| 14 | 365435296162 |
| 15 | 2504730781961 |
| 16 | 17167680177565 |
| 17 | 117669030460994 |
| 18 | 806515533049393 |
| 19 | 5527939700884757 |
| 20 | 37889062373143906 |
| 21 | 259695496911122585 |
| 22 | 1779979416004714189 |