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 | -12 |
| 3 | -73 |
| 4 | -240 |
| 5 | -593 |
| 6 | -1232 |
| 7 | -2273 |
| 8 | -3840 |
| 9 | -6049 |
| 10 | -8976 |
| 11 | -12593 |
| 12 | -16640 |
| 13 | -20369 |
| 14 | -22032 |
| 15 | -17857 |
| 16 | 0 |
| 17 | 47551 |
| 18 | 157168 |
| 19 | 393967 |
| 20 | 888576 |
| 21 | 1902671 |
| 22 | 3960048 |
| 23 | 8108767 |
| 24 | 16445440 |
| 25 | 33163807 |
| 26 | 66651888 |
| 27 | 133686287 |
| 28 | 267820800 |
| 29 | 536163631 |
| 30 | 1072931824 |