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 | 6 |
| 2 | 36 |
| 3 | 84 |
| 4 | 198 |
| 5 | 474 |
| 6 | 1140 |
| 7 | 2748 |
| 8 | 6630 |
| 9 | 16002 |
| 10 | 38628 |
| 11 | 93252 |
| 12 | 225126 |
| 13 | 543498 |
| 14 | 1312116 |
| 15 | 3167724 |
| 16 | 7647558 |
| 17 | 18462834 |
| 18 | 44573220 |
| 19 | 107609268 |
| 20 | 259791750 |
| 21 | 627192762 |
| 22 | 1514177268 |
| 23 | 3655547292 |
| 24 | 8825271846 |
| 25 | 21306090978 |
| 26 | 51437453796 |
| 27 | 124180998564 |