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 | 1 |
| 2 | 8 |
| 3 | 50 |
| 4 | 276 |
| 5 | 1397 |
| 6 | 6672 |
| 7 | 30565 |
| 8 | 135668 |
| 9 | 587426 |
| 10 | 2493056 |
| 11 | 10407393 |
| 12 | 42848800 |
| 13 | 174348417 |
| 14 | 702245128 |
| 15 | 2803634370 |
| 16 | 11106624804 |
| 17 | 43697519013 |
| 18 | 170871040752 |
| 19 | 664492915061 |
| 20 | 2571316718500 |
| 21 | 9905232077842 |
| 22 | 38000679280352 |
| 23 | 145240335213857 |
| 24 | 553203971301184 |
| 25 | 2100403987129441 |
| 26 | 7951405959127848 |