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 | 3 |
| 3 | 11 |
| 4 | 44 |
| 5 | 186 |
| 6 | 813 |
| 7 | 3640 |
| 8 | 16590 |
| 9 | 76663 |
| 10 | 358195 |
| 11 | 1688784 |
| 12 | 8022273 |
| 13 | 38351973 |
| 14 | 184353219 |
| 15 | 890371070 |
| 16 | 4318095442 |
| 17 | 21018564402 |
| 18 | 102642526470 |
| 19 | 502709028125 |
| 20 | 2468566918644 |
| 21 | 12150769362815 |
| 22 | 59937663454017 |