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 | 3 |
| 3 | 15 |
| 4 | 35 |
| 5 | 105 |
| 6 | 357 |
| 7 | 1045 |
| 8 | 1485 |
| 9 | 3135 |
| 10 | 3339 |
| 11 | 5049 |
| 12 | 10659 |
| 13 | 12441 |
| 14 | 16065 |
| 15 | 24871 |
| 16 | 24969 |
| 17 | 29029 |
| 18 | 33915 |
| 19 | 35343 |
| 20 | 39105 |
| 21 | 39585 |
| 22 | 50065 |
| 23 | 58435 |
| 24 | 64285 |
| 25 | 71145 |
| 26 | 74613 |
| 27 | 87087 |
| 28 | 87685 |
| 29 | 99693 |
| 30 | 124355 |
| 31 | 124605 |
| 32 | 132957 |
| 33 | 137885 |
| 34 | 140335 |
| 35 | 145145 |
| 36 | 150195 |