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 | 7 |
| 2 | 32 |
| 3 | 269 |
| 4 | 3072 |
| 5 | 29643 |
| 6 | 254368 |
| 7 | 2080345 |
| 8 | 16744448 |
| 9 | 134158679 |
| 10 | 1073641824 |
| 11 | 8589773541 |
| 12 | 68719227904 |
| 13 | 549755442595 |
| 14 | 4398045973280 |
| 15 | 35184371329457 |
| 16 | 281474975662080 |
| 17 | 2251799812265391 |
| 18 | 18014398507592416 |
| 19 | 144115188073379773 |
| 20 | 1152921504603646976 |