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 | 3 |
| 3 | 22 |
| 4 | 305 |
| 5 | 6756 |
| 6 | 216552 |
| 7 | 9416240 |
| 8 | 530764089 |
| 9 | 37498693555 |
| 10 | 3235722405487 |
| 11 | 334075729235172 |
| 12 | 40587204883652869 |
| 13 | 5722676826879812177 |
| 14 | 925590727478445526747 |
| 15 | 170032646641380554970304 |
| 16 | 35173161711207720944899921 |
| 17 | 8132124409499796317194563900 |