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 | 12 |
| 2 | 70 |
| 3 | 280 |
| 4 | 905 |
| 5 | 2568 |
| 6 | 6666 |
| 7 | 16220 |
| 8 | 37580 |
| 9 | 83780 |
| 10 | 181074 |
| 11 | 381488 |
| 12 | 786715 |
| 13 | 1593160 |
| 14 | 3176210 |
| 15 | 6246732 |
| 16 | 12139859 |
| 17 | 23344760 |
| 18 | 44471340 |
| 19 | 84005640 |
| 20 | 157483176 |
| 21 | 293201912 |
| 22 | 542468100 |
| 23 | 997906400 |
| 24 | 1826073525 |