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 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 91 |
| 6 | 541 |
| 7 | 1891 |
| 8 | 5041 |
| 9 | 249481 |
| 10 | 3424681 |
| 11 | 24365881 |
| 12 | 119821681 |
| 13 | 4208219731 |
| 14 | 96849813061 |
| 15 | 1133147785771 |
| 16 | 8728726799521 |
| 17 | 251218306095121 |
| 18 | 8116398738418321 |
| 19 | 138787857114672241 |
| 20 | 1523943014238675361 |
| 21 | 39648007379230971211 |
| 22 | 1599866285860593980461 |