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 | 8 |
| 2 | 39 |
| 3 | 150 |
| 4 | 501 |
| 5 | 1524 |
| 6 | 4339 |
| 7 | 11762 |
| 8 | 30705 |
| 9 | 77808 |
| 10 | 192495 |
| 11 | 466926 |
| 12 | 1114093 |
| 13 | 2621420 |
| 14 | 6094827 |
| 15 | 14024682 |
| 16 | 31981545 |
| 17 | 72351720 |
| 18 | 162529255 |
| 19 | 362807270 |
| 20 | 805306341 |
| 21 | 1778384868 |
| 22 | 3909091299 |
| 23 | 8556380130 |
| 24 | 18656264161 |
| 25 | 40533753824 |