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 | -34 |
| 2 | 510 |
| 3 | -4420 |
| 4 | 24310 |
| 5 | -87516 |
| 6 | 204204 |
| 7 | -291720 |
| 8 | 218790 |
| 9 | -48620 |
| 10 | -9724 |
| 11 | -5304 |
| 12 | -4420 |
| 13 | -4760 |
| 14 | -6120 |
| 15 | -8976 |
| 16 | -14586 |
| 17 | -25740 |
| 18 | -48620 |
| 19 | -97240 |
| 20 | -204204 |
| 21 | -447304 |
| 22 | -1016600 |
| 23 | -2386800 |
| 24 | -5768100 |
| 25 | -14304888 |
| 26 | -36312408 |
| 27 | -94143280 |
| 28 | -248807240 |
| 29 | -669205680 |
| 30 | -1829162192 |