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 | 7 |
| 2 | 20 |
| 3 | 64 |
| 4 | 208 |
| 5 | 651 |
| 6 | 2056 |
| 7 | 6496 |
| 8 | 20483 |
| 9 | 64627 |
| 10 | 203905 |
| 11 | 643272 |
| 12 | 2029453 |
| 13 | 6402679 |
| 14 | 20199560 |
| 15 | 63726952 |
| 16 | 201050056 |
| 17 | 634285971 |
| 18 | 2001087460 |
| 19 | 6313163200 |
| 20 | 19917184799 |
| 21 | 62836052203 |
| 22 | 198239333473 |
| 23 | 625418559696 |
| 24 | 1973111833705 |
| 25 | 6224903700199 |