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) |
|---|---|
| 12 | 1 |
| 13 | 26 |
| 14 | 378 |
| 15 | 4060 |
| 16 | 35960 |
| 17 | 278256 |
| 18 | 1947792 |
| 19 | 12620256 |
| 20 | 76904685 |
| 21 | 445891810 |
| 22 | 2481256778 |
| 23 | 13340783196 |
| 24 | 69668534468 |
| 25 | 354860518600 |
| 26 | 1768966344600 |
| 27 | 8654327655120 |
| 28 | 41648951840265 |
| 29 | 197548686920970 |
| 30 | 925029565741050 |
| 31 | 4282083008118300 |
| 32 | 19619725782651120 |
| 33 | 89067326568860640 |