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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 14 |
| 4 | 50 |
| 5 | 186 |
| 6 | 714 |
| 7 | 2794 |
| 8 | 11050 |
| 9 | 43946 |
| 10 | 175274 |
| 11 | 700074 |
| 12 | 2798250 |
| 13 | 11188906 |
| 14 | 44747434 |
| 15 | 178973354 |
| 16 | 715860650 |
| 17 | 2863377066 |
| 18 | 11453377194 |
| 19 | 45813246634 |
| 20 | 183252462250 |
| 21 | 733008800426 |
| 22 | 2932033104554 |
| 23 | 11728128223914 |
| 24 | 46912504507050 |
| 25 | 187650001250986 |
| 26 | 750599971449514 |