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) |
|---|---|
| 1 | 0 |
| 2 | 343 |
| 3 | 17576 |
| 4 | 250047 |
| 5 | 1906624 |
| 6 | 9938375 |
| 7 | 40001688 |
| 8 | 133432831 |
| 9 | 385828352 |
| 10 | 997002999 |
| 11 | 2352637000 |
| 12 | 5150827583 |
| 13 | 10590025536 |
| 14 | 20638466407 |
| 15 | 38409197624 |
| 16 | 68669157375 |
| 17 | 118515478528 |
| 18 | 198257271191 |
| 19 | 322546580712 |
| 20 | 511808023999 |