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 | -4 |
| 2 | 6 |
| 3 | -14 |
| 4 | 27 |
| 5 | -54 |
| 6 | 110 |
| 7 | -217 |
| 8 | 445 |
| 9 | -905 |
| 10 | 1863 |
| 11 | -3858 |
| 12 | 7986 |
| 13 | -16599 |
| 14 | 34438 |
| 15 | -71445 |
| 16 | 148075 |
| 17 | -306551 |
| 18 | 634469 |
| 19 | -1312707 |
| 20 | 2716636 |
| 21 | -5624353 |
| 22 | 11649994 |
| 23 | -24144393 |
| 24 | 50059148 |
| 25 | -103820127 |
| 26 | 215351391 |
| 27 | -446713118 |
| 28 | 926604822 |
| 29 | -1921881919 |
| 30 | 3985904949 |
| 31 | -8266207127 |
| 32 | 17142752984 |