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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 5 |
| 6 | 12 |
| 7 | 26 |
| 8 | 60 |
| 9 | 143 |
| 10 | 353 |
| 11 | 879 |
| 12 | 2200 |
| 13 | 5528 |
| 14 | 13963 |
| 15 | 35421 |
| 16 | 90122 |
| 17 | 229729 |
| 18 | 586438 |
| 19 | 1498966 |
| 20 | 3836099 |
| 21 | 9827905 |
| 22 | 25202549 |
| 23 | 64683193 |
| 24 | 166137751 |
| 25 | 427022480 |
| 26 | 1098291533 |
| 27 | 2826500851 |
| 28 | 7278246356 |
| 29 | 18751418071 |
| 30 | 48334451894 |
| 31 | 124647030884 |