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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 18 |
| 7 | 42 |
| 8 | 96 |
| 9 | 229 |
| 10 | 549 |
| 11 | 1347 |
| 12 | 3326 |
| 13 | 8330 |
| 14 | 21000 |
| 15 | 53407 |
| 16 | 136639 |
| 17 | 351757 |
| 18 | 909962 |
| 19 | 2365146 |
| 20 | 6172068 |
| 21 | 16166991 |
| 22 | 42488077 |
| 23 | 112004630 |
| 24 | 296080425 |
| 25 | 784688263 |
| 26 | 2084521232 |
| 27 | 5549613097 |
| 28 | 14804572332 |
| 29 | 39568107511 |
| 30 | 105938822149 |