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) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 34 |
| 3 | 148 |
| 4 | 616 |
| 5 | 2512 |
| 6 | 10144 |
| 7 | 40768 |
| 8 | 163456 |
| 9 | 654592 |
| 10 | 2619904 |
| 11 | 10482688 |
| 12 | 41936896 |
| 13 | 167759872 |
| 14 | 671064064 |
| 15 | 2684305408 |
| 16 | 10737319936 |
| 17 | 42949476352 |
| 18 | 171798298624 |
| 19 | 687193980928 |
| 20 | 2748777496576 |
| 21 | 10995113132032 |
| 22 | 43980458819584 |