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 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 6 |
| 5 | 16 |
| 6 | 37 |
| 7 | 92 |
| 8 | 245 |
| 9 | 560 |
| 10 | 1426 |
| 11 | 3720 |
| 12 | 9069 |
| 13 | 22808 |
| 14 | 58177 |
| 15 | 145660 |
| 16 | 366318 |
| 17 | 925536 |
| 18 | 2331269 |
| 19 | 5872212 |
| 20 | 14802941 |
| 21 | 37311528 |
| 22 | 94038250 |
| 23 | 236999064 |
| 24 | 597348237 |
| 25 | 1505640016 |
| 26 | 3794761257 |
| 27 | 9564393972 |
| 28 | 24106951622 |
| 29 | 60759989040 |
| 30 | 153141435269 |
| 31 | 385986293964 |