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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 4 |
| 6 | 12 |
| 7 | 24 |
| 8 | 66 |
| 9 | 160 |
| 10 | 448 |
| 11 | 1186 |
| 12 | 3334 |
| 13 | 9235 |
| 14 | 26166 |
| 15 | 73983 |
| 16 | 211297 |
| 17 | 604107 |
| 18 | 1736328 |
| 19 | 5000593 |
| 20 | 14448984 |
| 21 | 41835738 |
| 22 | 121419260 |
| 23 | 353045291 |
| 24 | 1028452717 |
| 25 | 3000800627 |
| 26 | 8769216722 |
| 27 | 25661961898 |
| 28 | 75195166667 |
| 29 | 220605519559 |
| 30 | 647943626796 |
| 31 | 1905104762320 |
| 32 | 5607039506627 |
| 33 | 16517895669575 |