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 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 6 |
| 6 | 13 |
| 7 | 26 |
| 8 | 55 |
| 9 | 122 |
| 10 | 283 |
| 11 | 669 |
| 12 | 1650 |
| 13 | 4176 |
| 14 | 10694 |
| 15 | 28002 |
| 16 | 75555 |
| 17 | 209402 |
| 18 | 585212 |
| 19 | 1674296 |
| 20 | 4860120 |
| 21 | 14206194 |
| 22 | 42353033 |
| 23 | 127836257 |
| 24 | 392646335 |
| 25 | 1232237672 |
| 26 | 3906383039 |
| 27 | 12444691408 |
| 28 | 40024883480 |
| 29 | 129326254765 |