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 | 2 |
| 2 | 8 |
| 3 | 26 |
| 4 | 74 |
| 5 | 200 |
| 6 | 530 |
| 7 | 1394 |
| 8 | 3656 |
| 9 | 9578 |
| 10 | 25082 |
| 11 | 65672 |
| 12 | 171938 |
| 13 | 450146 |
| 14 | 1178504 |
| 15 | 3085370 |
| 16 | 8077610 |
| 17 | 21147464 |
| 18 | 55364786 |
| 19 | 144946898 |
| 20 | 379475912 |
| 21 | 993480842 |
| 22 | 2600966618 |
| 23 | 6809419016 |
| 24 | 17827290434 |
| 25 | 46672452290 |
| 26 | 122190066440 |
| 27 | 319897747034 |