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 | 1 |
| 1 | 32 |
| 2 | 142 |
| 3 | -51904 |
| 4 | -2036660 |
| 5 | 117944192 |
| 6 | 12755884744 |
| 7 | -215972352256 |
| 8 | -85665947681648 |
| 9 | -1217409408294400 |
| 10 | 641059191631501024 |
| 11 | 31251445113364640768 |
| 12 | -5219510033581154430272 |
| 13 | -497789616154448299657216 |
| 14 | 43917634328099171108467840 |
| 15 | 7552070478774301079638274048 |