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 | 2 |
| 2 | 8 |
| 3 | 36 |
| 4 | 166 |
| 5 | 768 |
| 6 | 3554 |
| 7 | 16446 |
| 8 | 76102 |
| 9 | 352152 |
| 10 | 1629536 |
| 11 | 7540458 |
| 12 | 34892452 |
| 13 | 161460114 |
| 14 | 747134894 |
| 15 | 3457265922 |
| 16 | 15998031616 |
| 17 | 74028732924 |
| 18 | 342557973998 |
| 19 | 1585140808368 |
| 20 | 7335025230994 |
| 21 | 33941839649382 |
| 22 | 157061283704438 |
| 23 | 726779900373936 |
| 24 | 3363075935260696 |