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 | 6 |
| 3 | 20 |
| 4 | 42 |
| 5 | 156 |
| 6 | 272 |
| 7 | 342 |
| 8 | 930 |
| 9 | 3660 |
| 10 | 7832 |
| 11 | 11342 |
| 12 | 16002 |
| 13 | 270920 |
| 14 | 367842 |
| 15 | 1634562 |
| 16 | 4851006 |
| 17 | 5200680 |
| 18 | 10345872 |
| 19 | 18083756 |
| 20 | 19558506 |
| 21 | 93867032 |
| 22 | 98813540 |
| 23 | 125720156 |
| 24 | 397464032 |
| 25 | 470911700 |
| 26 | 538634472 |
| 27 | 1979938512 |
| 28 | 7437768806 |
| 29 | 12210802506 |