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 | 18 |
| 2 | 42 |
| 3 | 84 |
| 4 | 126 |
| 5 | 252 |
| 6 | 756 |
| 7 | 1998 |
| 8 | 1596 |
| 9 | 2394 |
| 10 | 4662 |
| 11 | 4788 |
| 12 | 9324 |
| 13 | 18648 |
| 14 | 23940 |
| 15 | 46620 |
| 16 | 93240 |
| 17 | 139860 |
| 18 | 177156 |
| 19 | 559440 |
| 20 | 354312 |
| 21 | 708624 |
| 22 | 1062936 |
| 23 | 885780 |
| 24 | 4606056 |
| 25 | 1771560 |
| 26 | 3543120 |
| 27 | 5314680 |
| 28 | 10629360 |
| 29 | 38974320 |
| 30 | 23030280 |
| 31 | 46060560 |
| 32 | 69090840 |
| 33 | 138181680 |
| 34 | 506666160 |