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) |
|---|---|
| 3 | 1 |
| 4 | 4 |
| 5 | 30 |
| 6 | 12 |
| 7 | 98 |
| 8 | 28 |
| 9 | 270 |
| 10 | 60 |
| 11 | 682 |
| 12 | 124 |
| 13 | 1638 |
| 14 | 252 |
| 15 | 3810 |
| 16 | 508 |
| 17 | 8670 |
| 18 | 1020 |
| 19 | 19418 |
| 20 | 2044 |
| 21 | 42966 |
| 22 | 4092 |
| 23 | 94162 |
| 24 | 8188 |
| 25 | 204750 |
| 26 | 16380 |
| 27 | 442314 |
| 28 | 32764 |
| 29 | 950214 |
| 30 | 65532 |
| 31 | 2031554 |
| 32 | 131068 |
| 33 | 4325310 |
| 34 | 262140 |
| 35 | 9174970 |
| 36 | 524284 |
| 37 | 19398582 |
| 38 | 1048572 |
| 39 | 40894386 |
| 40 | 2097148 |
| 41 | 85983150 |