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 | 7 |
| 3 | 18 |
| 4 | 50 |
| 5 | 120 |
| 6 | 418 |
| 7 | 2114 |
| 8 | 10140 |
| 9 | 41544 |
| 10 | 164022 |
| 11 | 730136 |
| 12 | 3770982 |
| 13 | 20541820 |
| 14 | 110476618 |
| 15 | 580834748 |
| 16 | 3013771544 |
| 17 | 15539996378 |
| 18 | 79715421726 |