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 | 2 |
| 3 | 8 |
| 4 | 34 |
| 5 | 121 |
| 6 | 606 |
| 7 | 2155 |
| 8 | 11306 |
| 9 | 40717 |
| 10 | 217666 |
| 11 | 792351 |
| 12 | 4280046 |
| 13 | 15703156 |
| 14 | 85410872 |
| 15 | 315180458 |
| 16 | 1722900242 |
| 17 | 6385672193 |
| 18 | 35040356022 |