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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 11 |
| 4 | 34 |
| 5 | 212 |
| 6 | 804 |
| 7 | 5567 |
| 8 | 24014 |
| 9 | 178148 |
| 10 | 839596 |
| 11 | 6501420 |
| 12 | 32658872 |
| 13 | 259775440 |
| 14 | 1368965576 |
| 15 | 11080668871 |
| 16 | 60613092662 |
| 17 | 496461841956 |
| 18 | 2798385807012 |
| 19 | 23113333523180 |
| 20 | 133539494791000 |
| 21 | 1109722749130576 |
| 22 | 6545965568001272 |