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 | 9 |
| 3 | 19 |
| 4 | 37 |
| 5 | 127 |
| 6 | 323 |
| 7 | 763 |
| 8 | 2121 |
| 9 | 5557 |
| 10 | 14031 |
| 11 | 37065 |
| 12 | 97027 |
| 13 | 250371 |
| 14 | 653707 |
| 15 | 1706245 |
| 16 | 4431885 |
| 17 | 11544027 |
| 18 | 30085525 |
| 19 | 78290135 |
| 20 | 203852347 |
| 21 | 530958219 |
| 22 | 1382353401 |
| 23 | 3599332477 |
| 24 | 9373032927 |
| 25 | 24405570561 |
| 26 | 63547912011 |
| 27 | 165475162027 |
| 28 | 430875964651 |