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) |
|---|---|
| 1 | 1 |
| 2 | 446 |
| 3 | 31663 |
| 4 | 2691211 |
| 5 | 219689604 |
| 6 | 18054912942 |
| 7 | 1481559445366 |
| 8 | 121595969760961 |
| 9 | 9979148121938539 |
| 10 | 818972532183106546 |
| 11 | 67211557641378928789 |
| 12 | 5515926988608836197348 |