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 | 1 |
| 2 | 4 |
| 3 | 14 |
| 4 | 55 |
| 5 | 217 |
| 6 | 908 |
| 7 | 3864 |
| 8 | 16894 |
| 9 | 75078 |
| 10 | 338862 |
| 11 | 1548055 |
| 12 | 7147427 |
| 13 | 33294790 |
| 14 | 156305144 |
| 15 | 738753341 |
| 16 | 3512431392 |
| 17 | 16788169689 |
| 18 | 80619590577 |
| 19 | 388785776751 |
| 20 | 1882063496033 |
| 21 | 9142361671588 |
| 22 | 44550166132194 |
| 23 | 217716111661799 |
| 24 | 1066792279046783 |
| 25 | 5239947708977474 |
| 26 | 25795965431819883 |