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 | 4 |
| 3 | 9 |
| 4 | 27 |
| 5 | 61 |
| 6 | 185 |
| 7 | 469 |
| 8 | 1428 |
| 9 | 4292 |
| 10 | 14456 |
| 11 | 50040 |
| 12 | 186525 |
| 13 | 724023 |
| 14 | 2952085 |
| 15 | 12476584 |
| 16 | 54670003 |
| 17 | 246823085 |
| 18 | 1148176939 |
| 19 | 5479962138 |
| 20 | 26831059535 |
| 21 | 134411101756 |
| 22 | 688922857792 |
| 23 | 3604792968605 |
| 24 | 19250556430137 |
| 25 | 104789182807326 |
| 26 | 581220024906812 |
| 27 | 3280986439096740 |