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 | 3 |
| 3 | 7 |
| 4 | 23 |
| 5 | 77 |
| 6 | 297 |
| 7 | 1163 |
| 8 | 4783 |
| 9 | 20041 |
| 10 | 85735 |
| 11 | 371955 |
| 12 | 1634429 |
| 13 | 7254547 |
| 14 | 32486709 |
| 15 | 146576693 |
| 16 | 665720447 |
| 17 | 3041096613 |
| 18 | 13963651875 |
| 19 | 64410421307 |
| 20 | 298331882891 |
| 21 | 1386933722321 |
| 22 | 6469566027565 |
| 23 | 30271114380919 |
| 24 | 142037330038069 |
| 25 | 668187211909327 |