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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 7 |
| 5 | 24 |
| 6 | 95 |
| 7 | 388 |
| 8 | 1650 |
| 9 | 7183 |
| 10 | 31965 |
| 11 | 144502 |
| 12 | 662241 |
| 13 | 3068942 |
| 14 | 14358678 |
| 15 | 67729973 |
| 16 | 321759461 |
| 17 | 1538076291 |
| 18 | 7392775328 |
| 19 | 35707198905 |
| 20 | 173221206284 |
| 21 | 843634142771 |
| 22 | 4123376617009 |
| 23 | 20218897206392 |
| 24 | 99436453714990 |
| 25 | 490355165178472 |
| 26 | 2424146632435852 |