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 | 14 |
| 1 | 28 |
| 2 | 76 |
| 3 | 227 |
| 4 | 715 |
| 5 | 2333 |
| 6 | 7810 |
| 7 | 26663 |
| 8 | 92456 |
| 9 | 324700 |
| 10 | 1152464 |
| 11 | 4127294 |
| 12 | 14895145 |
| 13 | 54115895 |
| 14 | 197764350 |
| 15 | 726473055 |
| 16 | 2680979820 |
| 17 | 9934884960 |
| 18 | 36953107320 |
| 19 | 137913387450 |
| 20 | 516295313430 |
| 21 | 1938260223354 |