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 | -10 |
| 2 | -12 |
| 3 | -44 |
| 4 | -102 |
| 5 | -280 |
| 6 | -720 |
| 7 | -1898 |
| 8 | -4956 |
| 9 | -12988 |
| 10 | -33990 |
| 11 | -89000 |
| 12 | -232992 |
| 13 | -609994 |
| 14 | -1596972 |
| 15 | -4180940 |
| 16 | -10945830 |
| 17 | -28656568 |
| 18 | -75023856 |
| 19 | -196415018 |
| 20 | -514221180 |
| 21 | -1346248540 |
| 22 | -3524524422 |
| 23 | -9227324744 |
| 24 | -24157449792 |
| 25 | -63245024650 |
| 26 | -165577624140 |