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 | 8 |
| 2 | 45 |
| 3 | 211 |
| 4 | 891 |
| 5 | 3510 |
| 6 | 13170 |
| 7 | 47672 |
| 8 | 167898 |
| 9 | 578769 |
| 10 | 1961103 |
| 11 | 6552549 |
| 12 | 21641343 |
| 13 | 70784235 |
| 14 | 229620285 |
| 15 | 739640331 |
| 16 | 2368022638 |
| 17 | 7541358405 |
| 18 | 23905443556 |
| 19 | 75468582776 |
| 20 | 237388273398 |
| 21 | 744299007994 |
| 22 | 2326899224352 |