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 | 1 |
| 1 | 10 |
| 2 | 65 |
| 3 | 346 |
| 4 | 1637 |
| 5 | 7218 |
| 6 | 30529 |
| 7 | 126034 |
| 8 | 513125 |
| 9 | 2072698 |
| 10 | 8335505 |
| 11 | 33439914 |
| 12 | 133972165 |
| 13 | 536346850 |
| 14 | 2146369793 |
| 15 | 8587575586 |
| 16 | 34354757957 |
| 17 | 137428468074 |
| 18 | 549733794193 |
| 19 | 2198977118650 |
| 20 | 8795996553701 |
| 21 | 35184170762770 |