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 | 0 |
| 2 | 0 |
| 3 | 3 |
| 4 | 1 |
| 5 | 51 |
| 6 | 89 |
| 7 | 11 |
| 8 | 417 |
| 9 | 1251 |
| 10 | 9897 |
| 11 | 13307 |
| 12 | 3057 |
| 13 | 21459 |
| 14 | 64377 |
| 15 | 1765995 |
| 16 | 1103681 |
| 17 | 28476867 |
| 18 | 51876169 |
| 19 | 21410779 |
| 20 | 265558929 |
| 21 | 796676787 |
| 22 | 5611255833 |
| 23 | 8243832907 |
| 24 | 3256662241 |
| 25 | 22654888611 |
| 26 | 67964665833 |
| 27 | 1028527718331 |
| 28 | 886559899441 |
| 29 | 15853819231635 |
| 30 | 29969271650489 |