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 | 2 |
| 2 | 7 |
| 3 | 23 |
| 4 | 81 |
| 5 | 291 |
| 6 | 1066 |
| 7 | 3955 |
| 8 | 14818 |
| 9 | 55937 |
| 10 | 212428 |
| 11 | 810664 |
| 12 | 3106167 |
| 13 | 11942261 |
| 14 | 46047897 |
| 15 | 178000950 |
| 16 | 689580319 |
| 17 | 2676598447 |
| 18 | 10406929687 |
| 19 | 40525045518 |
| 20 | 158022343991 |
| 21 | 616950024334 |
| 22 | 2411395005316 |
| 23 | 9434753907065 |
| 24 | 36948692202031 |