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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 1491629 |
| 11 | 195728778 |
| 12 | 14019733828 |
| 13 | 724646387874 |
| 14 | 30220873171570 |
| 15 | 1079253898643492 |
| 16 | 34231899372185491 |
| 17 | 988157793188200998 |
| 18 | 26412878913430197293 |
| 19 | 662133032168309300424 |
| 20 | 15719783014093104131694 |