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) |
|---|---|
| 3 | 4128 |
| 4 | 45696 |
| 5 | 287160 |
| 6 | 2172480 |
| 7 | 11866848 |
| 8 | 76468352 |
| 9 | 390714840 |
| 10 | 2301083680 |
| 11 | 11288784144 |
| 12 | 62812654272 |
| 13 | 299720429528 |
| 14 | 1604776566400 |
| 15 | 7505573487360 |
| 16 | 39105991164160 |
| 17 | 180179056818584 |
| 18 | 920223907284960 |
| 19 | 4191443432295472 |
| 20 | 21088555826121280 |
| 21 | 95195388883597464 |
| 22 | 473503955161244480 |