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 | -6 |
| 2 | 15 |
| 3 | -26 |
| 4 | 51 |
| 5 | -102 |
| 6 | 172 |
| 7 | -276 |
| 8 | 453 |
| 9 | -728 |
| 10 | 1128 |
| 11 | -1698 |
| 12 | 2539 |
| 13 | -3780 |
| 14 | 5505 |
| 15 | -7882 |
| 16 | 11238 |
| 17 | -15918 |
| 18 | 22259 |
| 19 | -30810 |
| 20 | 42438 |
| 21 | -58110 |
| 22 | 78909 |
| 23 | -106392 |
| 24 | 142770 |
| 25 | -190698 |
| 26 | 253179 |
| 27 | -334266 |
| 28 | 439581 |
| 29 | -575784 |
| 30 | 750613 |
| 31 | -974316 |
| 32 | 1260336 |
| 33 | -1624702 |
| 34 | 2086530 |
| 35 | -2670162 |