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) |
|---|---|
| 2 | 2 |
| 3 | 7 |
| 4 | 29 |
| 5 | 601 |
| 6 | 29 |
| 7 | 116929 |
| 8 | 11887 |
| 9 | 4778489 |
| 10 | 82207 |
| 11 | 296987 |
| 12 | 2767 |
| 13 | 464089 |
| 14 | 36922117 |
| 15 | 71722471217 |
| 16 | 10219277051 |
| 17 | 9406703479 |
| 18 | 2040247819 |
| 19 | 122450719 |
| 20 | 1265072927 |
| 21 | 18353142818474353 |
| 22 | 21514105057 |
| 23 | 46999724987 |
| 24 | 29693667067 |
| 25 | 5684341885088084044195811037649 |
| 26 | 692132186353 |
| 27 | 12114317049616531 |