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 | -3 |
| 2 | -3 |
| 3 | 8 |
| 4 | 9 |
| 5 | 18 |
| 6 | -35 |
| 7 | -33 |
| 8 | -66 |
| 9 | -91 |
| 10 | 216 |
| 11 | 189 |
| 12 | 386 |
| 13 | 315 |
| 14 | 333 |
| 15 | -1483 |
| 16 | -2268 |
| 17 | -2214 |
| 18 | -1883 |
| 19 | -456 |
| 20 | -801 |
| 21 | 23032 |
| 22 | 12186 |
| 23 | 22665 |
| 24 | 18622 |
| 25 | -20328 |
| 26 | -39549 |
| 27 | -78834 |
| 28 | -146838 |
| 29 | -249342 |
| 30 | -146662 |
| 31 | 15678 |
| 32 | 564771 |
| 33 | 238159 |
| 34 | 1274913 |
| 35 | 1398063 |
| 36 | 1572593 |
| 37 | 1423266 |
| 38 | -833778 |
| 39 | -3484732 |
| 40 | -5261736 |
| 41 | -9671502 |