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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 11 |
| 4 | 45 |
| 5 | 105 |
| 6 | 325 |
| 7 | 989 |
| 8 | 3268 |
| 9 | 10125 |
| 10 | 33017 |
| 11 | 111435 |
| 12 | 369576 |
| 13 | 1277044 |
| 14 | 4362878 |
| 15 | 15233325 |
| 16 | 53647473 |
| 17 | 189461874 |
| 18 | 676856245 |
| 19 | 2422723580 |
| 20 | 8743378141 |
| 21 | 31684991912 |
| 22 | 115347765988 |
| 23 | 421763257890 |
| 24 | 1548503690949 |
| 25 | 5702720842940 |
| 26 | 21074884894536 |
| 27 | 78123777847065 |