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) |
|---|---|
| 3 | 41 |
| 4 | 113 |
| 5 | 320 |
| 6 | 908 |
| 7 | 2574 |
| 8 | 7317 |
| 9 | 20855 |
| 10 | 59582 |
| 11 | 170681 |
| 12 | 490180 |
| 13 | 1411207 |
| 14 | 4072092 |
| 15 | 11774998 |
| 16 | 34114389 |
| 17 | 99006951 |
| 18 | 287783255 |
| 19 | 837649471 |
| 20 | 2441108294 |
| 21 | 7121588680 |
| 22 | 20795782761 |
| 23 | 60775937523 |
| 24 | 177746557324 |
| 25 | 520168686310 |
| 26 | 1523090681155 |
| 27 | 4461852378404 |
| 28 | 13076323061624 |