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 | 14 |
| 3 | 39 |
| 4 | 100 |
| 5 | 125 |
| 6 | 546 |
| 7 | -1421 |
| 8 | 15464 |
| 9 | -132615 |
| 10 | 1336150 |
| 11 | -14683009 |
| 12 | 176216844 |
| 13 | -2290790411 |
| 14 | 32071104170 |
| 15 | -481066511925 |
| 16 | 7697064256336 |
| 17 | -130850092274191 |
| 18 | 2355301661040414 |
| 19 | -44750731559637545 |
| 20 | 895014631192910900 |
| 21 | -18795307255050934419 |