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 | 5 |
| 3 | 102 |
| 4 | 2970 |
| 5 | 16450 |
| 6 | 997220 |
| 7 | 18268740 |
| 8 | 37403100 |
| 9 | 2539082700 |
| 10 | 23305436 |
| 11 | 141249408300 |
| 12 | 97836438700 |