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 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 4 |
| 7 | 7 |
| 8 | 13 |
| 9 | 24 |
| 10 | 46 |
| 11 | 85 |
| 12 | 160 |
| 13 | 301 |
| 14 | 570 |
| 15 | 1083 |
| 16 | 2064 |
| 17 | 3943 |
| 18 | 7553 |
| 19 | 14501 |
| 20 | 27901 |
| 21 | 53784 |
| 22 | 103859 |
| 23 | 200867 |
| 24 | 389044 |
| 25 | 754502 |
| 26 | 1465037 |
| 27 | 2847895 |
| 28 | 5541797 |
| 29 | 10794360 |
| 30 | 21044286 |
| 31 | 41061688 |
| 32 | 80182834 |
| 33 | 156692019 |
| 34 | 306417804 |
| 35 | 599604941 |
| 36 | 1174044166 |
| 37 | 2300154199 |
| 38 | 4508885393 |
| 39 | 8843184248 |