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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 1 |
| 5 | 4 |
| 6 | 13 |
| 7 | 151 |
| 8 | 16 |
| 9 | 83 |
| 10 | 73 |
| 11 | 1433 |
| 12 | 647 |
| 13 | 15341 |
| 14 | 28211 |
| 15 | 10447 |
| 16 | 608 |
| 17 | 19345 |
| 18 | 18181 |
| 19 | 651745 |
| 20 | 771079 |
| 21 | 731957 |
| 22 | 2786599 |
| 23 | 122289917 |
| 24 | 14614772 |
| 25 | 140001721 |
| 26 | 134354573 |
| 27 | 774885169 |
| 28 | 745984697 |
| 29 | 41711914513 |
| 30 | 80530073893 |
| 31 | 4825521853483 |