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 | 8 |
| 3 | 44 |
| 4 | 260 |
| 5 | 1556 |
| 6 | 9332 |
| 7 | 55988 |
| 8 | 335924 |
| 9 | 2015540 |
| 10 | 12093236 |
| 11 | 72559412 |
| 12 | 435356468 |
| 13 | 2612138804 |
| 14 | 15672832820 |
| 15 | 94036996916 |
| 16 | 564221981492 |
| 17 | 3385331888948 |
| 18 | 20311991333684 |
| 19 | 121871948002100 |
| 20 | 731231688012596 |
| 21 | 4387390128075572 |
| 22 | 26324340768453428 |
| 23 | 157946044610720564 |
| 24 | 947676267664323380 |