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) |
|---|---|
| 3 | 1 |
| 4 | 14 |
| 5 | 30 |
| 6 | 148 |
| 7 | 744 |
| 8 | 4610 |
| 9 | 32870 |
| 10 | 266972 |
| 11 | 2431608 |
| 12 | 24554194 |
| 13 | 272289630 |
| 14 | 3289836260 |
| 15 | 43017800312 |
| 16 | 605289111698 |
| 17 | 9119314568454 |
| 18 | 146474344313980 |
| 19 | 2498617856687400 |