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 | 2 |
| 5 | 5 |
| 6 | 12 |
| 7 | 33 |
| 8 | 94 |
| 9 | 290 |
| 10 | 949 |
| 11 | 3245 |
| 12 | 11666 |
| 13 | 43731 |
| 14 | 170748 |
| 15 | 689957 |
| 16 | 2887816 |
| 17 | 12458783 |
| 18 | 55406276 |
| 19 | 253142181 |
| 20 | 1187931688 |
| 21 | 5712032811 |
| 22 | 28131119950 |
| 23 | 141645386201 |
| 24 | 728841245442 |
| 25 | 3827217750406 |
| 26 | 20499431084637 |
| 27 | 111876916513388 |
| 28 | 621831333931916 |
| 29 | 3516904353610571 |