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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 11 |
| 6 | 22 |
| 7 | 74 |
| 8 | 174 |
| 9 | 530 |
| 10 | 1302 |
| 11 | 4713 |
| 12 | 10639 |
| 13 | 40877 |
| 14 | 101795 |
| 15 | 325609 |
| 16 | 925733 |
| 17 | 3432819 |
| 18 | 8078511 |
| 19 | 32542036 |
| 20 | 82226383 |
| 21 | 279096823 |
| 22 | 795532677 |
| 23 | 3066505569 |
| 24 | 7374764180 |
| 25 | 28946183035 |
| 26 | 79313174765 |
| 27 | 275507514909 |
| 28 | 772692247626 |
| 29 | 3049937788372 |
| 30 | 7071057261148 |