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 | 3 |
| 3 | 13 |
| 4 | 7 |
| 5 | 115 |
| 6 | 237 |
| 7 | 15 |
| 8 | 1935 |
| 9 | 7825 |
| 10 | 31473 |
| 11 | 31711 |
| 12 | 254649 |
| 13 | 15957 |
| 14 | 2050541 |
| 15 | 8219801 |
| 16 | 16490635 |
| 17 | 33035745 |
| 18 | 132455435 |
| 19 | 530485275 |
| 20 | 1061920785 |
| 21 | 4253619813 |
| 22 | 4256987887 |
| 23 | 34095896991 |
| 24 | 136471574881 |
| 25 | 273072139013 |
| 26 | 136638599097 |
| 27 | 2187167322891 |
| 28 | 4377196161075 |
| 29 | 4378797345767 |
| 30 | 35049397190341 |