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 | 1 |
| 3 | 3 |
| 4 | 15 |
| 5 | 21 |
| 6 | 45 |
| 7 | 153 |
| 8 | 231 |
| 9 | 325 |
| 10 | 561 |
| 11 | 903 |
| 12 | 2145 |
| 13 | 4095 |
| 14 | 8385 |
| 15 | 14535 |
| 16 | 33153 |
| 17 | 58311 |
| 18 | 63903 |
| 19 | 101475 |
| 20 | 131841 |
| 21 | 240471 |
| 22 | 399171 |
| 23 | 525825 |
| 24 | 932295 |
| 25 | 976503 |
| 26 | 1044735 |
| 27 | 1308153 |
| 28 | 1395285 |
| 29 | 1532125 |
| 30 | 2100225 |
| 31 | 3727815 |
| 32 | 8394753 |
| 33 | 14680071 |
| 34 | 17913105 |
| 35 | 33566721 |
| 36 | 54054003 |
| 37 | 59650503 |