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 | 48 |
| 2 | 148 |
| 3 | 460 |
| 4 | 1436 |
| 5 | 4488 |
| 6 | 14040 |
| 7 | 43940 |
| 8 | 137532 |
| 9 | 430508 |
| 10 | 1347652 |
| 11 | 4218704 |
| 12 | 13206360 |
| 13 | 41341772 |
| 14 | 129418260 |
| 15 | 405137308 |
| 16 | 1268262348 |
| 17 | 3970233208 |
| 18 | 12428621208 |
| 19 | 38907193300 |
| 20 | 121797075276 |
| 21 | 381279818252 |
| 22 | 1193577924020 |
| 23 | 3736437636672 |