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 | 0 |
| 1 | 1 |
| 2 | 7 |
| 3 | 43 |
| 4 | 259 |
| 5 | 1555 |
| 6 | 9331 |
| 7 | 55987 |
| 8 | 335923 |
| 9 | 2015539 |
| 10 | 12093235 |
| 11 | 72559411 |
| 12 | 435356467 |
| 13 | 2612138803 |
| 14 | 15672832819 |
| 15 | 94036996915 |
| 16 | 564221981491 |
| 17 | 3385331888947 |
| 18 | 20311991333683 |
| 19 | 121871948002099 |
| 20 | 731231688012595 |
| 21 | 4387390128075571 |