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 | 2048 |
| 3 | 177147 |
| 4 | 4194304 |
| 5 | 48828125 |
| 6 | 362797056 |
| 7 | 1977326743 |
| 8 | 8589934592 |
| 9 | 31381059609 |
| 10 | 100000000000 |
| 11 | 285311670611 |
| 12 | 743008370688 |
| 13 | 1792160394037 |
| 14 | 4049565169664 |
| 15 | 8649755859375 |
| 16 | 17592186044416 |
| 17 | 34271896307633 |
| 18 | 64268410079232 |
| 19 | 116490258898219 |
| 20 | 204800000000000 |