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 | 3 |
| 3 | 9 |
| 4 | 23 |
| 5 | 56 |
| 6 | 121 |
| 7 | 258 |
| 8 | 539 |
| 9 | 1118 |
| 10 | 2273 |
| 11 | 4614 |
| 12 | 9323 |
| 13 | 18806 |
| 14 | 37761 |
| 15 | 75798 |
| 16 | 151979 |
| 17 | 304598 |
| 18 | 609793 |
| 19 | 1220694 |
| 20 | 2442923 |
| 21 | 4888406 |
| 22 | 9779201 |
| 23 | 19562838 |
| 24 | 39131819 |
| 25 | 78273878 |
| 26 | 156557313 |
| 27 | 313132374 |
| 28 | 626289323 |
| 29 | 1252619606 |
| 30 | 2505277441 |
| 31 | 5010625878 |
| 32 | 10021350059 |