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 | 1 |
| 2 | 15 |
| 3 | 45 |
| 4 | 63 |
| 5 | 165 |
| 6 | 195 |
| 7 | 231 |
| 8 | 459 |
| 9 | 693 |
| 10 | 909 |
| 11 | 969 |
| 12 | 1299 |
| 13 | 1785 |
| 14 | 2709 |
| 15 | 3699 |
| 16 | 4131 |
| 17 | 4449 |
| 18 | 5145 |
| 19 | 7041 |
| 20 | 8541 |
| 21 | 10209 |
| 22 | 16065 |
| 23 | 20355 |
| 24 | 22569 |
| 25 | 27489 |
| 26 | 28299 |
| 27 | 38151 |
| 28 | 47745 |
| 29 | 49365 |
| 30 | 49959 |
| 31 | 58479 |
| 32 | 77619 |
| 33 | 81021 |
| 34 | 84651 |
| 35 | 87555 |
| 36 | 92625 |
| 37 | 101115 |
| 38 | 104181 |
| 39 | 107271 |
| 40 | 107349 |
| 41 | 108225 |