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 | 0 |
| 2 | 512 |
| 3 | 39366 |
| 4 | 786432 |
| 5 | 7812500 |
| 6 | 50388480 |
| 7 | 242121642 |
| 8 | 939524096 |
| 9 | 3099363912 |
| 10 | 9000000000 |
| 11 | 23579476910 |
| 12 | 56757583872 |
| 13 | 127253992476 |
| 14 | 268593608192 |
| 15 | 538207031250 |
| 16 | 1030792151040 |
| 17 | 1897406023952 |
| 18 | 3372107936256 |
| 19 | 5808378560022 |
| 20 | 9728000000000 |
| 21 | 15885600931620 |
| 22 | 25352653573632 |