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 | 13 |
| 2 | 97 |
| 3 | 545 |
| 4 | 2561 |
| 5 | 10625 |
| 6 | 40193 |
| 7 | 141569 |
| 8 | 471041 |
| 9 | 1496065 |
| 10 | 4571137 |
| 11 | 13516801 |
| 12 | 38862849 |
| 13 | 109051905 |
| 14 | 299565057 |
| 15 | 807600129 |
| 16 | 2141192193 |
| 17 | 5592842241 |
| 18 | 14413725697 |
| 19 | 36698062849 |
| 20 | 92408905729 |
| 21 | 230359564289 |
| 22 | 568965726209 |
| 23 | 1393398120449 |