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 | 0 |
| 2 | 0 |
| 3 | -2 |
| 4 | -2 |
| 5 | -2 |
| 6 | 4 |
| 7 | 10 |
| 8 | 16 |
| 9 | 2 |
| 10 | -32 |
| 11 | -86 |
| 12 | -90 |
| 13 | 26 |
| 14 | 332 |
| 15 | 646 |
| 16 | 534 |
| 17 | -690 |
| 18 | -3040 |
| 19 | -4934 |
| 20 | -2270 |
| 21 | 9066 |
| 22 | 27260 |
| 23 | 35198 |
| 24 | 532 |
| 25 | -101946 |
| 26 | -232752 |
| 27 | -230730 |
| 28 | 158986 |
| 29 | 1039078 |
| 30 | 1899364 |
| 31 | 1265370 |
| 32 | -2714160 |
| 33 | -9926158 |
| 34 | -14625008 |
| 35 | -4036358 |
| 36 | 34062386 |
| 37 | 89744810 |
| 38 | 104123084 |