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 | 450 |
| 2 | 1400 |
| 3 | 3500 |
| 4 | 7560 |
| 5 | 14700 |
| 6 | 26400 |
| 7 | 44550 |
| 8 | 71500 |
| 9 | 110110 |
| 10 | 163800 |
| 11 | 236600 |
| 12 | 333200 |
| 13 | 459000 |
| 14 | 620160 |
| 15 | 823650 |
| 16 | 1077300 |
| 17 | 1389850 |
| 18 | 1771000 |
| 19 | 2231460 |
| 20 | 2783000 |
| 21 | 3438500 |
| 22 | 4212000 |
| 23 | 5118750 |
| 24 | 6175260 |
| 25 | 7399350 |
| 26 | 8810200 |
| 27 | 10428400 |
| 28 | 12276000 |
| 29 | 14376560 |