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) |
|---|---|
| 3 | 1 |
| 4 | 7 |
| 5 | 36 |
| 6 | 186 |
| 7 | 1023 |
| 8 | 5867 |
| 9 | 34744 |
| 10 | 211888 |
| 11 | 1343046 |
| 12 | 8896185 |
| 13 | 61801182 |
| 14 | 449917898 |
| 15 | 3425580850 |
| 16 | 27183592435 |
| 17 | 224196765392 |
| 18 | 1917038645772 |
| 19 | 16963064269986 |
| 20 | 155112925687673 |
| 21 | 1464150720422785 |
| 22 | 14253033440621462 |
| 23 | 142967758696293317 |
| 24 | 1476398153663677539 |