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 | 4 |
| 2 | 10 |
| 3 | 20 |
| 4 | 36 |
| 5 | 76 |
| 6 | 160 |
| 7 | 344 |
| 8 | 748 |
| 9 | 1624 |
| 10 | 3544 |
| 11 | 7724 |
| 12 | 16856 |
| 13 | 36776 |
| 14 | 80252 |
| 15 | 175128 |
| 16 | 382168 |
| 17 | 833996 |
| 18 | 1819992 |
| 19 | 3971720 |
| 20 | 8667356 |
| 21 | 18914520 |
| 22 | 41276600 |
| 23 | 90076716 |
| 24 | 196571800 |
| 25 | 428972904 |
| 26 | 936135100 |
| 27 | 2042900376 |
| 28 | 4458162072 |
| 29 | 9728917388 |