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 | 0 |
| 2 | 23 |
| 3 | 115 |
| 4 | 168 |
| 5 | 539 |
| 6 | 1977 |
| 7 | 5942 |
| 8 | 16733 |
| 9 | 49219 |
| 10 | 159516 |
| 11 | 493401 |
| 12 | 1460747 |
| 13 | 4425266 |
| 14 | 13722727 |
| 15 | 42140581 |
| 16 | 127606254 |
| 17 | 388561273 |
| 18 | 1192422089 |
| 19 | 3648989388 |
| 20 | 11120119943 |
| 21 | 33934405093 |
| 22 | 103799531930 |
| 23 | 317293759665 |
| 24 | 968655453293 |
| 25 | 2958170322080 |