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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 10 |
| 5 | 39 |
| 6 | 160 |
| 7 | 702 |
| 8 | 3177 |
| 9 | 14830 |
| 10 | 70678 |
| 11 | 342860 |
| 12 | 1686486 |
| 13 | 8393681 |
| 14 | 42187148 |
| 15 | 213828802 |
| 16 | 1091711076 |
| 17 | 5609297942 |
| 18 | 28982708389 |
| 19 | 150496728594 |
| 20 | 784952565145 |
| 21 | 4110491658233 |
| 22 | 21602884608167 |
| 23 | 113907912618599 |
| 24 | 602414753753310 |
| 25 | 3194684310627727 |
| 26 | 16984594260224529 |