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 | 4 |
| 2 | 22 |
| 3 | 94 |
| 4 | 364 |
| 5 | 1336 |
| 6 | 4738 |
| 7 | 16402 |
| 8 | 55768 |
| 9 | 186988 |
| 10 | 620014 |
| 11 | 2037190 |
| 12 | 6643012 |
| 13 | 21523360 |
| 14 | 69353050 |
| 15 | 222408058 |
| 16 | 710270896 |
| 17 | 2259952852 |
| 18 | 7167279046 |
| 19 | 22664098606 |
| 20 | 71479080220 |
| 21 | 224897593864 |
| 22 | 706073841202 |
| 23 | 2212364702434 |
| 24 | 6919523643784 |
| 25 | 21605859540796 |
| 26 | 67359444450718 |