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 | 1 |
| 4 | 1 |
| 5 | 4 |
| 6 | 9 |
| 7 | 26 |
| 8 | 66 |
| 9 | 183 |
| 10 | 488 |
| 11 | 1342 |
| 12 | 3690 |
| 13 | 10220 |
| 14 | 28470 |
| 15 | 79720 |
| 16 | 224230 |
| 17 | 633040 |
| 18 | 1793727 |
| 19 | 5097638 |
| 20 | 14528640 |
| 21 | 41509364 |
| 22 | 118868750 |
| 23 | 341098474 |
| 24 | 980661510 |
| 25 | 2824295364 |
| 26 | 8147015352 |
| 27 | 23535794889 |
| 28 | 68085719208 |
| 29 | 197213728060 |
| 30 | 571919889400 |
| 31 | 1660412355602 |
| 32 | 4825573629390 |