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 | -28 |
| 3 | -235 |
| 4 | -1008 |
| 5 | -3093 |
| 6 | -7712 |
| 7 | -16679 |
| 8 | -32512 |
| 9 | -58537 |
| 10 | -98976 |
| 11 | -159003 |
| 12 | -244736 |
| 13 | -363101 |
| 14 | -521440 |
| 15 | -726607 |
| 16 | -983040 |
| 17 | -1288785 |
| 18 | -1627424 |
| 19 | -1951811 |
| 20 | -2151424 |
| 21 | -1986949 |
| 22 | -959328 |
| 23 | 1952265 |
| 24 | 8814592 |
| 25 | 23788807 |
| 26 | 55227488 |
| 27 | 119868821 |
| 28 | 251225088 |