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 | 6 |
| 3 | 17 |
| 4 | 50 |
| 5 | 157 |
| 6 | 495 |
| 7 | 1574 |
| 8 | 5031 |
| 9 | 16123 |
| 10 | 51749 |
| 11 | 166241 |
| 12 | 534301 |
| 13 | 1717724 |
| 14 | 5523165 |
| 15 | 17760715 |
| 16 | 57115518 |
| 17 | 183679098 |
| 18 | 590706934 |
| 19 | 1899713778 |
| 20 | 6109510235 |
| 21 | 19648337645 |
| 22 | 63189642502 |
| 23 | 203219959503 |
| 24 | 653562362810 |
| 25 | 2101879559822 |
| 26 | 6759719676624 |