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) |
|---|---|
| 0 | 0 |
| 1 | 15 |
| 2 | 60 |
| 3 | 135 |
| 4 | 240 |
| 5 | 375 |
| 6 | 540 |
| 7 | 735 |
| 8 | 960 |
| 9 | 1215 |
| 10 | 1500 |
| 11 | 1815 |
| 12 | 2160 |
| 13 | 2535 |
| 14 | 2940 |
| 15 | 3375 |
| 16 | 3840 |
| 17 | 4335 |
| 18 | 4860 |
| 19 | 5415 |
| 20 | 6000 |
| 21 | 6615 |
| 22 | 7260 |
| 23 | 7935 |
| 24 | 8640 |
| 25 | 9375 |
| 26 | 10140 |
| 27 | 10935 |
| 28 | 11760 |
| 29 | 12615 |
| 30 | 13500 |
| 31 | 14415 |
| 32 | 15360 |
| 33 | 16335 |
| 34 | 17340 |
| 35 | 18375 |
| 36 | 19440 |
| 37 | 20535 |
| 38 | 21660 |
| 39 | 22815 |