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 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 38 |
| 5 | 163 |
| 6 | 774 |
| 7 | 4006 |
| 8 | 22376 |
| 9 | 133951 |
| 10 | 854402 |
| 11 | 5775948 |
| 12 | 41190317 |
| 13 | 308651432 |
| 14 | 2422315371 |
| 15 | 19856073597 |
| 16 | 169596622997 |
| 17 | 1506139073454 |
| 18 | 13879704561038 |
| 19 | 132488897335228 |
| 20 | 1307829322689944 |
| 21 | 13330635710335512 |
| 22 | 140118664473276174 |
| 23 | 1516899115597189064 |