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 | 8 |
| 3 | 100 |
| 4 | 1432 |
| 5 | 22570 |
| 6 | 377320 |
| 7 | 6578116 |
| 8 | 118238600 |
| 9 | 2175619923 |
| 10 | 40778137032 |
| 11 | 775828919936 |
| 12 | 14944103723856 |
| 13 | 290858342628604 |
| 14 | 5711285455910096 |
| 15 | 113005043943326568 |
| 16 | 2250850657029983808 |
| 17 | 45095294493866921469 |
| 18 | 908159403846847306568 |
| 19 | 18373705506139825769712 |