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 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 22 |
| 5 | 44 |
| 6 | 212 |
| 7 | 242 |
| 8 | 464 |
| 9 | 2552 |
| 10 | 8558 |
| 11 | 40604 |
| 12 | 41414 |
| 13 | 85558 |
| 14 | 229922 |
| 15 | 805508 |
| 16 | 2029202 |
| 17 | 2342432 |
| 18 | 2737372 |
| 19 | 4006004 |
| 20 | 4437344 |
| 21 | 4767674 |
| 22 | 281585182 |
| 23 | 400060004 |
| 24 | 440727044 |
| 25 | 805282508 |
| 26 | 8059999508 |
| 27 | 40000600004 |
| 28 | 47997579974 |
| 29 | 251476674152 |
| 30 | 2626540456262 |
| 31 | 2728292928272 |