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) |
|---|---|
| 1 | 1 |
| 2 | -20 |
| 3 | -80 |
| 4 | 144 |
| 5 | 610 |
| 6 | -448 |
| 7 | -1120 |
| 8 | 2240 |
| 9 | -3423 |
| 10 | -12200 |
| 11 | 14800 |
| 12 | 29440 |
| 13 | -5470 |
| 14 | -6272 |
| 15 | -48800 |
| 16 | -81664 |
| 17 | 73090 |
| 18 | 68460 |
| 19 | 15600 |
| 20 | 87840 |
| 21 | -139776 |
| 22 | 82880 |
| 23 | 189920 |
| 24 | -474112 |
| 25 | -18525 |
| 26 | 109400 |
| 27 | -251040 |
| 28 | 412160 |
| 29 | -128222 |
| 30 | -273280 |
| 31 | 54400 |
| 32 | 1059840 |
| 33 | 1847040 |