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 | 6 |
| 2 | 56 |
| 3 | 292 |
| 4 | 1254 |
| 5 | 4942 |
| 6 | 18584 |
| 7 | 67756 |
| 8 | 241542 |
| 9 | 846502 |
| 10 | 2927816 |
| 11 | 10023380 |
| 12 | 34042358 |
| 13 | 114900334 |
| 14 | 385933816 |
| 15 | 1291392908 |
| 16 | 4308452150 |
| 17 | 14341213590 |
| 18 | 47651315192 |
| 19 | 158111069492 |
| 20 | 524063522870 |
| 21 | 1735584459598 |
| 22 | 5744207323976 |
| 23 | 19002070568572 |
| 24 | 62835884445574 |
| 25 | 207725012781046 |
| 26 | 686552300486040 |