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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 29 |
| 6 | 95 |
| 7 | 345 |
| 8 | 1376 |
| 9 | 5966 |
| 10 | 27886 |
| 11 | 139608 |
| 12 | 744552 |
| 13 | 4210191 |
| 14 | 25140790 |
| 15 | 157981820 |
| 16 | 1041480482 |
| 17 | 7183374125 |
| 18 | 51711299169 |
| 19 | 387683162541 |
| 20 | 3020997261596 |
| 21 | 24424884853963 |
| 22 | 204559337781097 |
| 23 | 1772011400733378 |
| 24 | 15855597322378302 |
| 25 | 146360032952969570 |