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) |
|---|---|
| 1 | 2 |
| 2 | 12 |
| 3 | 32 |
| 4 | 150 |
| 5 | 282 |
| 6 | 1890 |
| 7 | 3488 |
| 8 | 21582 |
| 9 | 54650 |
| 10 | 282612 |
| 11 | 705564 |
| 12 | 4072224 |
| 13 | 10400782 |
| 14 | 55006530 |
| 15 | 158987232 |
| 16 | 790611350 |
| 17 | 2333606526 |
| 18 | 11573213196 |
| 19 | 35345264180 |
| 20 | 168673694070 |
| 21 | 540848064614 |
| 22 | 2500462200182 |
| 23 | 8233430728152 |
| 24 | 37445946291600 |
| 25 | 126411051769652 |