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 | 1 |
| 4 | 1 |
| 5 | 0 |
| 6 | -2 |
| 7 | -5 |
| 8 | -9 |
| 9 | -8 |
| 10 | 7 |
| 11 | 48 |
| 12 | 120 |
| 13 | 161 |
| 14 | -18 |
| 15 | -798 |
| 16 | -2486 |
| 17 | -4088 |
| 18 | -692 |
| 19 | 19840 |
| 20 | 71159 |
| 21 | 130467 |
| 22 | 31737 |
| 23 | -688014 |
| 24 | -2644266 |
| 25 | -5066453 |
| 26 | -866551 |
| 27 | 31217375 |
| 28 | 121457519 |
| 29 | 231494879 |
| 30 | -10834753 |
| 31 | -1756652362 |
| 32 | -6638239650 |
| 33 | -12044755426 |
| 34 | 5372265122 |
| 35 | 117373545212 |