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 | 8 |
| 2 | 12 |
| 3 | 140 |
| 4 | 416 |
| 5 | 2844 |
| 6 | 11148 |
| 7 | 62368 |
| 8 | 275708 |
| 9 | 1420076 |
| 10 | 6614240 |
| 11 | 32897116 |
| 12 | 156718796 |
| 13 | 767930400 |
| 14 | 3694025404 |
| 15 | 17985757548 |
| 16 | 86879470432 |
| 17 | 421850136604 |
| 18 | 2041379040012 |
| 19 | 9900460336800 |
| 20 | 47946203889788 |
| 21 | 232416817429420 |
| 22 | 1125924852017632 |