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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 4 |
| 6 | 13 |
| 7 | 34 |
| 8 | 83 |
| 9 | 188 |
| 10 | 413 |
| 11 | 878 |
| 12 | 1839 |
| 13 | 3792 |
| 14 | 7761 |
| 15 | 15762 |
| 16 | 31891 |
| 17 | 64276 |
| 18 | 129301 |
| 19 | 259606 |
| 20 | 520727 |
| 21 | 1043480 |
| 22 | 2090009 |
| 23 | 4184090 |
| 24 | 8374299 |
| 25 | 16756764 |
| 26 | 33525789 |
| 27 | 67067934 |
| 28 | 134160415 |
| 29 | 268353568 |
| 30 | 536756257 |
| 31 | 1073578018 |
| 32 | 2147254307 |
| 33 | 4294639652 |
| 34 | 8589475877 |