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 | 5 |
| 2 | 28 |
| 3 | 156 |
| 4 | 863 |
| 5 | 4571 |
| 6 | 22952 |
| 7 | 108182 |
| 8 | 477136 |
| 9 | 1969270 |
| 10 | 7625579 |
| 11 | 27804973 |
| 12 | 95858868 |
| 13 | 313747418 |
| 14 | 978734539 |
| 15 | 2920530663 |
| 16 | 8363945469 |
| 17 | 23057872913 |
| 18 | 61357278239 |
| 19 | 157985305473 |
| 20 | 394486861086 |
| 21 | 957156158394 |
| 22 | 2260761331227 |