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 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 15 |
| 6 | 31 |
| 7 | 73 |
| 8 | 157 |
| 9 | 358 |
| 10 | 785 |
| 11 | 1762 |
| 12 | 3896 |
| 13 | 8702 |
| 14 | 19299 |
| 15 | 42995 |
| 16 | 95507 |
| 17 | 212552 |
| 18 | 472445 |
| 19 | 1050973 |
| 20 | 2336670 |
| 21 | 5197036 |
| 22 | 11556157 |
| 23 | 25700188 |
| 24 | 57150018 |
| 25 | 127093805 |
| 26 | 282627186 |
| 27 | 628514815 |
| 28 | 1397684691 |
| 29 | 3108193486 |
| 30 | 6911996344 |
| 31 | 15370966058 |