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 | 38 |
| 2 | 386 |
| 3 | -65740 |
| 4 | -3723284 |
| 5 | 136726888 |
| 6 | 24891794104 |
| 7 | 77945890928 |
| 8 | -181386683278960 |
| 9 | -7552427985415072 |
| 10 | 1440171734736484384 |
| 11 | 134631214005677868352 |
| 12 | -11644732516647446263616 |
| 13 | -2151777728648689174614400 |
| 14 | 78394097345318787274427264 |
| 15 | 34851107415866497970816728832 |