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 | 2 |
| 2 | 12 |
| 3 | 50 |
| 4 | 188 |
| 5 | 652 |
| 6 | 2140 |
| 7 | 6766 |
| 8 | 20868 |
| 9 | 63118 |
| 10 | 188004 |
| 11 | 553074 |
| 12 | 1610776 |
| 13 | 4651784 |
| 14 | 13338744 |
| 15 | 38014494 |
| 16 | 107767964 |
| 17 | 304100432 |
| 18 | 854624852 |
| 19 | 2393093804 |
| 20 | 6679440288 |
| 21 | 18589013256 |
| 22 | 51597951784 |
| 23 | 142880148016 |
| 24 | 394791197276 |
| 25 | 1088674291748 |
| 26 | 2996639940048 |