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 | 6 |
| 3 | 31 |
| 4 | 156 |
| 5 | 781 |
| 6 | 3906 |
| 7 | 19531 |
| 8 | 97656 |
| 9 | 488281 |
| 10 | 2441406 |
| 11 | 12207031 |
| 12 | 61035156 |
| 13 | 305175781 |
| 14 | 1525878906 |
| 15 | 7629394531 |
| 16 | 38146972656 |
| 17 | 190734863281 |
| 18 | 953674316406 |
| 19 | 4768371582031 |
| 20 | 23841857910156 |
| 21 | 119209289550781 |
| 22 | 596046447753906 |
| 23 | 2980232238769531 |