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 | 38 |
| 3 | 1407 |
| 4 | 52060 |
| 5 | 1926221 |
| 6 | 71270178 |
| 7 | 2636996587 |
| 8 | 97568873720 |
| 9 | 3610048327641 |
| 10 | 133571788122718 |
| 11 | 4942156160540567 |
| 12 | 182859777940000980 |
| 13 | 6765811783780036261 |
| 14 | 250335035999861341658 |
| 15 | 9262396331994869641347 |
| 16 | 342708664283810176729840 |
| 17 | 12680220578500976539004081 |