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 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | 5 |
| 6 | 21 |
| 7 | 42 |
| 8 | 122 |
| 9 | 225 |
| 10 | 570 |
| 11 | 990 |
| 12 | 2321 |
| 13 | 3913 |
| 14 | 8827 |
| 15 | 14480 |
| 16 | 31802 |
| 17 | 51425 |
| 18 | 110928 |
| 19 | 177270 |
| 20 | 377722 |
| 21 | 598437 |
| 22 | 1264307 |
| 23 | 1990098 |
| 24 | 4175201 |
| 25 | 6540605 |
| 26 | 13653822 |
| 27 | 21301740 |
| 28 | 44288071 |
| 29 | 68877929 |
| 30 | 142736091 |
| 31 | 221392266 |
| 32 | 457560122 |
| 33 | 708106245 |
| 34 | 1460194770 |
| 35 | 2255365152 |
| 36 | 4641851924 |