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 | 3 |
| 2 | 0 |
| 3 | 9 |
| 4 | 6 |
| 5 | 39 |
| 6 | 24 |
| 7 | 153 |
| 8 | 102 |
| 9 | 615 |
| 10 | 408 |
| 11 | 2457 |
| 12 | 1638 |
| 13 | 9831 |
| 14 | 6552 |
| 15 | 39321 |
| 16 | 26214 |
| 17 | 157287 |
| 18 | 104856 |
| 19 | 629145 |
| 20 | 419430 |
| 21 | 2516583 |
| 22 | 1677720 |
| 23 | 10066329 |
| 24 | 6710886 |
| 25 | 40265319 |
| 26 | 26843544 |
| 27 | 161061273 |
| 28 | 107374182 |
| 29 | 644245095 |
| 30 | 429496728 |
| 31 | 2576980377 |
| 32 | 1717986918 |
| 33 | 10307921511 |
| 34 | 6871947672 |