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) |
|---|---|
| 6 | 1 |
| 7 | 21 |
| 8 | 378 |
| 9 | 7056 |
| 10 | 143325 |
| 11 | 3207897 |
| 12 | 79170399 |
| 13 | 2146836978 |
| 14 | 63641666088 |
| 15 | 2051450651250 |
| 16 | 71530799628288 |
| 17 | 2684845732979592 |
| 18 | 107992630908804096 |
| 19 | 4636019437800293718 |
| 20 | 211623646464000000000 |
| 21 | 10237455825414473977524 |
| 22 | 523244238837133507448832 |
| 23 | 28177157277452320985386539 |