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 | 6 |
| 3 | 26 |
| 4 | 94 |
| 5 | 314 |
| 6 | 986 |
| 7 | 3160 |
| 8 | 9990 |
| 9 | 31614 |
| 10 | 99996 |
| 11 | 316206 |
| 12 | 999960 |
| 13 | 3162246 |
| 14 | 9999960 |
| 15 | 31622764 |
| 16 | 99999966 |
| 17 | 316227734 |
| 18 | 999999924 |
| 19 | 3162277654 |
| 20 | 9999999956 |
| 21 | 31622776500 |
| 22 | 99999999964 |
| 23 | 316227766006 |
| 24 | 999999999886 |
| 25 | 3162277660140 |