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 | 2 |
| 3 | 541 |
| 4 | 52100 |
| 5 | 58504 |
| 6 | 66410 |
| 7 | 430000 |
| 8 | 863180 |
| 9 | 8601400 |
| 10 | 17927300 |
| 11 | 27927300 |
| 12 | 31000000 |
| 13 | 665100000 |
| 14 | 3715000000 |
| 15 | 6739630000 |
| 16 | 11000000000 |
| 17 | 21000000000 |
| 18 | 53100000000 |
| 19 | 70858000000 |
| 20 | 79637300000 |
| 21 | 451000000000 |
| 22 | 1715000000000 |
| 23 | 2715000000000 |
| 24 | 48304000000000 |
| 25 | 340000000000000 |
| 26 | 5520000000000000 |