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 | 3 |
| 3 | 8 |
| 4 | 22 |
| 5 | 62 |
| 6 | 176 |
| 7 | 500 |
| 8 | 1420 |
| 9 | 4032 |
| 10 | 11448 |
| 11 | 32504 |
| 12 | 92288 |
| 13 | 262032 |
| 14 | 743984 |
| 15 | 2112384 |
| 16 | 5997664 |
| 17 | 17029088 |
| 18 | 48350464 |
| 19 | 137280832 |
| 20 | 389779648 |
| 21 | 1106696192 |
| 22 | 3142227840 |
| 23 | 8921685888 |