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 | 0 |
| 2 | 17 |
| 3 | 59 |
| 4 | 289 |
| 5 | 1293 |
| 6 | 5913 |
| 7 | 26911 |
| 8 | 122621 |
| 9 | 558547 |
| 10 | 2544357 |
| 11 | 11590169 |
| 12 | 52796369 |
| 13 | 240501763 |
| 14 | 1095550873 |
| 15 | 4990531051 |
| 16 | 22733220441 |
| 17 | 103555975477 |
| 18 | 471725515497 |
| 19 | 2148837489879 |
| 20 | 9788536778149 |
| 21 | 44589436230083 |
| 22 | 203116958964733 |