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 | 56 |
| 3 | 392 |
| 4 | 2648 |
| 5 | 17864 |
| 6 | 118760 |
| 7 | 789032 |
| 8 | 5201048 |
| 9 | 34268104 |
| 10 | 224679864 |
| 11 | 1472595144 |
| 12 | 9619740648 |
| 13 | 62823141192 |
| 14 | 409297617672 |
| 15 | 2665987056200 |
| 16 | 17333875251192 |
| 17 | 112680746646856 |
| 18 | 731466943653464 |
| 19 | 4747546469665832 |
| 20 | 30779106675700312 |
| 21 | 199518218638233896 |
| 22 | 1292141318087690824 |
| 23 | 8367300424426139624 |
| 24 | 54141252229349325768 |
| 25 | 350288350314921653160 |