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 | 4 |
| 3 | 19 |
| 4 | 70 |
| 5 | 245 |
| 6 | 856 |
| 7 | 2967 |
| 8 | 10164 |
| 9 | 34463 |
| 10 | 115904 |
| 11 | 387379 |
| 12 | 1288574 |
| 13 | 4270853 |
| 14 | 14116936 |
| 15 | 46567963 |
| 16 | 153385198 |