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 | 0 |
| 2 | 0 |
| 3 | 9 |
| 4 | 30 |
| 5 | 92 |
| 6 | 198 |
| 7 | 396 |
| 8 | 684 |
| 9 | 1152 |
| 10 | 1760 |
| 11 | 2650 |
| 12 | 3780 |
| 13 | 5292 |
| 14 | 7140 |
| 15 | 9555 |
| 16 | 12376 |
| 17 | 15936 |
| 18 | 20088 |
| 19 | 25110 |
| 20 | 30870 |
| 21 | 37800 |
| 22 | 45540 |
| 23 | 54692 |
| 24 | 64944 |
| 25 | 76752 |
| 26 | 89856 |
| 27 | 104949 |
| 28 | 121394 |
| 29 | 140140 |
| 30 | 160650 |
| 31 | 183600 |
| 32 | 208560 |
| 33 | 236544 |
| 34 | 266560 |
| 35 | 299982 |
| 36 | 335988 |
| 37 | 375516 |
| 38 | 417924 |
| 39 | 464607 |