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 | -3 |
| 2 | -18 |
| 3 | -45 |
| 4 | -192 |
| 5 | -459 |
| 6 | -1914 |
| 7 | -4557 |
| 8 | -18960 |
| 9 | -45123 |
| 10 | -187698 |
| 11 | -446685 |
| 12 | -1858032 |
| 13 | -4421739 |
| 14 | -18392634 |
| 15 | -43770717 |
| 16 | -182068320 |
| 17 | -433285443 |
| 18 | -1802290578 |
| 19 | -4289083725 |
| 20 | -17840837472 |
| 21 | -42457551819 |
| 22 | -176606084154 |
| 23 | -420286434477 |
| 24 | -1748220004080 |
| 25 | -4160406792963 |