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 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 8 |
| 7 | 19 |
| 8 | 47 |
| 9 | 119 |
| 10 | 309 |
| 11 | 805 |
| 12 | 2115 |
| 13 | 5594 |
| 14 | 14920 |
| 15 | 40037 |
| 16 | 108068 |
| 17 | 293124 |
| 18 | 798739 |
| 19 | 2185380 |
| 20 | 6001797 |
| 21 | 16538728 |
| 22 | 45716315 |
| 23 | 126727586 |
| 24 | 352214041 |
| 25 | 981269274 |
| 26 | 2739925455 |
| 27 | 7666335708 |
| 28 | 21491822234 |
| 29 | 60358497108 |
| 30 | 169798015580 |
| 31 | 478420350367 |