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 | 4 |
| 3 | 10 |
| 4 | 25 |
| 5 | 58 |
| 6 | 130 |
| 7 | 286 |
| 8 | 620 |
| 9 | 1329 |
| 10 | 2827 |
| 11 | 5977 |
| 12 | 12559 |
| 13 | 26227 |
| 14 | 54493 |
| 15 | 112849 |
| 16 | 233272 |
| 17 | 481616 |
| 18 | 992955 |
| 19 | 2043238 |
| 20 | 4194649 |
| 21 | 8591014 |
| 22 | 17559133 |
| 23 | 35833948 |
| 24 | 73054885 |
| 25 | 148849186 |
| 26 | 303171755 |
| 27 | 617306563 |
| 28 | 1256452642 |
| 29 | 2555937826 |