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 | 18 |
| 2 | 324 |
| 3 | 612 |
| 4 | 2232 |
| 5 | 7272 |
| 6 | 25776 |
| 7 | 85536 |
| 8 | 300096 |
| 9 | 1004364 |
| 10 | 3501756 |
| 11 | 11782620 |
| 12 | 40900716 |
| 13 | 138145104 |
| 14 | 477983232 |
| 15 | 1619007480 |
| 16 | 5587936560 |
| 17 | 18968405364 |
| 18 | 65343675996 |
| 19 | 222184777860 |
| 20 | 764259590844 |
| 21 | 2602091320056 |
| 22 | 8940128392080 |