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) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 14 |
| 6 | 38 |
| 7 | 97 |
| 8 | 260 |
| 9 | 688 |
| 10 | 1856 |
| 11 | 4994 |
| 12 | 13550 |
| 13 | 36791 |
| 14 | 100302 |
| 15 | 273824 |
| 16 | 749316 |
| 17 | 2053247 |
| 18 | 5635266 |
| 19 | 15484532 |
| 20 | 42599485 |
| 21 | 117312742 |
| 22 | 323373356 |
| 23 | 892139389 |
| 24 | 2463252315 |
| 25 | 6806148956 |
| 26 | 18818714543 |
| 27 | 52065725034 |
| 28 | 144135111504 |
| 29 | 399232819042 |
| 30 | 1106385615943 |