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 | 0 |
| 1 | 1 |
| 2 | 6 |
| 3 | 11 |
| 4 | -84 |
| 5 | -779 |
| 6 | -2574 |
| 7 | 4031 |
| 8 | 88536 |
| 9 | 430441 |
| 10 | 369246 |
| 11 | -8545549 |
| 12 | -60504444 |
| 13 | -149387939 |
| 14 | 616283466 |
| 15 | 7432399271 |
| 16 | 29187308976 |
| 17 | -10686127919 |
| 18 | -793799491914 |
| 19 | -4495643753509 |
| 20 | -7128875223204 |
| 21 | 69617842498501 |
| 22 | 595928935571106 |
| 23 | 1835127550964111 |
| 24 | -3887458083492984 |