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 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 7 |
| 9 | 34 |
| 10 | 143 |
| 11 | 555 |
| 12 | 2050 |
| 13 | 7343 |
| 14 | 25809 |
| 15 | 89642 |
| 16 | 308986 |
| 17 | 1059786 |
| 18 | 3623524 |
| 19 | 12365973 |
| 20 | 42160774 |
| 21 | 143701920 |
| 22 | 489891138 |
| 23 | 1670965268 |
| 24 | 5703849531 |
| 25 | 19488123707 |
| 26 | 66652727622 |
| 27 | 228212500386 |
| 28 | 782258463295 |
| 29 | 2684464903407 |
| 30 | 9222805414564 |
| 31 | 31722184749945 |
| 32 | 109232421818064 |