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 | 3 |
| 3 | 12 |
| 4 | 64 |
| 5 | 363 |
| 6 | 2214 |
| 7 | 14043 |
| 8 | 91857 |
| 9 | 614676 |
| 10 | 4189254 |
| 11 | 28974915 |
| 12 | 202870938 |
| 13 | 1435094800 |
| 14 | 10241197917 |
| 15 | 73639001172 |
| 16 | 533004547453 |
| 17 | 3880381334415 |
| 18 | 28395656513145 |
| 19 | 208748382089131 |
| 20 | 1540935621796941 |
| 21 | 11417266889312313 |
| 22 | 84880193073070819 |
| 23 | 632976019285857201 |