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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 13 |
| 6 | 35 |
| 7 | 92 |
| 8 | 246 |
| 9 | 646 |
| 10 | 1705 |
| 11 | 4475 |
| 12 | 11755 |
| 13 | 30790 |
| 14 | 80738 |
| 15 | 211424 |
| 16 | 553780 |
| 17 | 1449999 |
| 18 | 3796903 |
| 19 | 9940710 |
| 20 | 26027151 |
| 21 | 68140743 |
| 22 | 178399767 |
| 23 | 467059142 |
| 24 | 1222789414 |
| 25 | 3201309100 |
| 26 | 8381170779 |
| 27 | 21942203523 |
| 28 | 57445520528 |
| 29 | 150394362117 |
| 30 | 393737778753 |
| 31 | 1030818974142 |