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 | 3 |
| 2 | 6 |
| 3 | 19 |
| 4 | 44 |
| 5 | 136 |
| 6 | 376 |
| 7 | 1061 |
| 8 | 2985 |
| 9 | 8431 |
| 10 | 24009 |
| 11 | 67983 |
| 12 | 193359 |
| 13 | 549697 |
| 14 | 1563545 |
| 15 | 4446173 |
| 16 | 12650545 |
| 17 | 35999714 |
| 18 | 102439796 |
| 19 | 291532841 |
| 20 | 829634988 |
| 21 | 2360947327 |
| 22 | 6719171580 |
| 23 | 19122499510 |
| 24 | 54423038535 |
| 25 | 154888366195 |