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 | 2 |
| 2 | 16 |
| 3 | 114 |
| 4 | 768 |
| 5 | 5010 |
| 6 | 32016 |
| 7 | 201698 |
| 8 | 1257472 |
| 9 | 7777314 |
| 10 | 47800080 |
| 11 | 292292946 |
| 12 | 1779856128 |
| 13 | 10799942322 |
| 14 | 65336473104 |
| 15 | 394246725570 |
| 16 | 2373580947456 |
| 17 | 14262064668738 |
| 18 | 85546366040592 |
| 19 | 512323096241714 |
| 20 | 3063932437123840 |
| 21 | 18300660294266322 |
| 22 | 109183694129335056 |