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 | 9 |
| 4 | 15 |
| 5 | 45 |
| 6 | 105 |
| 7 | 195 |
| 8 | 315 |
| 9 | 900 |
| 10 | 1575 |
| 11 | 2100 |
| 12 | 3900 |
| 13 | 6300 |
| 14 | 18900 |
| 15 | 25200 |
| 16 | 27300 |
| 17 | 31500 |
| 18 | 44100 |
| 19 | 81900 |
| 20 | 220500 |
| 21 | 245700 |
| 22 | 333900 |
| 23 | 409500 |
| 24 | 491400 |
| 25 | 573300 |
| 26 | 600600 |
| 27 | 1201200 |
| 28 | 2402400 |
| 29 | 3603600 |
| 30 | 4804800 |
| 31 | 7207200 |
| 32 | 10810800 |
| 33 | 14414400 |
| 34 | 20420400 |
| 35 | 21621600 |
| 36 | 40840800 |
| 37 | 43243200 |