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 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 15 |
| 6 | 43 |
| 7 | 116 |
| 8 | 329 |
| 9 | 918 |
| 10 | 2609 |
| 11 | 7391 |
| 12 | 21099 |
| 13 | 60248 |
| 14 | 172683 |
| 15 | 495509 |
| 16 | 1424937 |
| 17 | 4102693 |
| 18 | 11830006 |
| 19 | 34148859 |
| 20 | 98686001 |
| 21 | 285459772 |
| 22 | 826473782 |
| 23 | 2394774727 |
| 24 | 6944343654 |
| 25 | 20151175658 |
| 26 | 58513084011 |
| 27 | 170007600051 |
| 28 | 494230862633 |