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 | 2 |
| 2 | 2 |
| 3 | 7 |
| 4 | 14 |
| 5 | 37 |
| 6 | 100 |
| 7 | 271 |
| 8 | 742 |
| 9 | 2054 |
| 10 | 5813 |
| 11 | 16507 |
| 12 | 47501 |
| 13 | 137306 |
| 14 | 399685 |
| 15 | 1169789 |
| 16 | 3438915 |
| 17 | 10153559 |
| 18 | 30083443 |
| 19 | 89426830 |
| 20 | 266598341 |
| 21 | 796863253 |
| 22 | 2387439540 |
| 23 | 7168302094 |
| 24 | 21565117858 |
| 25 | 64993345011 |
| 26 | 196202749033 |
| 27 | 593205591259 |
| 28 | 1796057856430 |
| 29 | 5445108651668 |
| 30 | 16528162238845 |