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 | 3 |
| 2 | 19 |
| 3 | 179 |
| 4 | 379 |
| 5 | 691 |
| 6 | 1187 |
| 7 | 1307 |
| 8 | 4787 |
| 9 | 15467 |
| 10 | 22307 |
| 11 | 43067 |
| 12 | 83579 |
| 13 | 273323 |
| 14 | 373459 |
| 15 | 1543291 |
| 16 | 5364091 |
| 17 | 5768803 |
| 18 | 20941259 |
| 19 | 137649667 |
| 20 | 251522291 |
| 21 | 369352163 |
| 22 | 426008699 |
| 23 | 938378747 |
| 24 | 1042908091 |
| 25 | 1378014731 |
| 26 | 1878780427 |
| 27 | 11474650339 |
| 28 | 12402606331 |
| 29 | 15931938899 |
| 30 | 51025309339 |
| 31 | 144309631099 |