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 | 3 |
| 2 | 13 |
| 3 | 68 |
| 4 | 395 |
| 5 | 2383 |
| 6 | 14628 |
| 7 | 91002 |
| 8 | 572629 |
| 9 | 3635105 |
| 10 | 23230955 |
| 11 | 149252778 |
| 12 | 963125552 |
| 13 | 6238012172 |
| 14 | 40529533578 |
| 15 | 264038158806 |
| 16 | 1724159758595 |
| 17 | 11281813669783 |
| 18 | 73955009216581 |
| 19 | 485575827838870 |
| 20 | 3192818972511443 |