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 | 2 |
| 3 | 5 |
| 4 | 13 |
| 5 | 43 |
| 6 | 152 |
| 7 | 559 |
| 8 | 2091 |
| 9 | 7882 |
| 10 | 29809 |
| 11 | 112895 |
| 12 | 427824 |
| 13 | 1621691 |
| 14 | 6147791 |
| 15 | 23307226 |
| 16 | 88363077 |
| 17 | 335007715 |
| 18 | 1270107208 |
| 19 | 4815336407 |
| 20 | 18256317315 |
| 21 | 69214939274 |
| 22 | 262413734345 |
| 23 | 994885963543 |
| 24 | 3771899000928 |
| 25 | 14300354743363 |