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 | 5 |
| 1 | 1 |
| 2 | 21 |
| 3 | 73 |
| 4 | 325 |
| 5 | 1361 |
| 6 | 5781 |
| 7 | 24473 |
| 8 | 103685 |
| 9 | 439201 |
| 10 | 1860501 |
| 11 | 7881193 |
| 12 | 33385285 |
| 13 | 141422321 |
| 14 | 599074581 |
| 15 | 2537720633 |
| 16 | 10749957125 |
| 17 | 45537549121 |
| 18 | 192900153621 |
| 19 | 817138163593 |
| 20 | 3461452808005 |
| 21 | 14662949395601 |
| 22 | 62113250390421 |
| 23 | 263115950957273 |
| 24 | 1114577054219525 |