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 | 6 |
| 2 | 21 |
| 3 | 54 |
| 4 | 108 |
| 5 | 162 |
| 6 | 135 |
| 7 | -162 |
| 8 | -1053 |
| 9 | -2916 |
| 10 | -5832 |
| 11 | -8748 |
| 12 | -8019 |
| 13 | 4374 |
| 14 | 41553 |
| 15 | 118098 |
| 16 | 236196 |
| 17 | 354294 |
| 18 | 334611 |
| 19 | -118098 |
| 20 | -1476225 |
| 21 | -4251528 |
| 22 | -8503056 |
| 23 | -12754584 |
| 24 | -12223143 |
| 25 | 3188646 |
| 26 | 49424013 |
| 27 | 143489070 |
| 28 | 286978140 |
| 29 | 430467210 |
| 30 | 416118303 |
| 31 | -86093442 |
| 32 | -1592728677 |