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 | 132 |
| 3 | 2709 |
| 4 | 26432 |
| 5 | 168126 |
| 6 | 804552 |
| 7 | 3136014 |
| 8 | 10459968 |
| 9 | 30856839 |
| 10 | 82407052 |
| 11 | 202678203 |
| 12 | 465069696 |
| 13 | 1005729452 |
| 14 | 2066218896 |
| 15 | 4058958828 |
| 16 | 7664805504 |
| 17 | 13974953853 |
| 18 | 24692818836 |
| 19 | 42415687153 |
| 20 | 71020845504 |
| 21 | 116186669130 |
| 22 | 186085891160 |
| 23 | 292296070170 |
| 24 | 450981236160 |
| 25 | 684408934755 |