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 | -1 |
| 2 | 1 |
| 3 | 11 |
| 4 | -12 |
| 5 | 1 |
| 6 | -301 |
| 7 | 330 |
| 8 | -30 |
| 9 | 1 |
| 10 | 15371 |
| 11 | -16856 |
| 12 | 1540 |
| 13 | -56 |
| 14 | 1 |
| 15 | -1261501 |
| 16 | 1383390 |
| 17 | -126420 |
| 18 | 4620 |
| 19 | -90 |
| 20 | 1 |
| 21 | 151846331 |
| 22 | -166518132 |
| 23 | 15217290 |
| 24 | -556248 |
| 25 | 10890 |
| 26 | -132 |
| 27 | 1 |
| 28 | -25201039501 |
| 29 | 27636032242 |
| 30 | -2525525002 |
| 31 | 92318226 |
| 32 | -1807806 |
| 33 | 22022 |
| 34 | -182 |
| 35 | 1 |