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 | 0 |
| 2 | 2 |
| 3 | 9 |
| 4 | 30 |
| 5 | 80 |
| 6 | 180 |
| 7 | 357 |
| 8 | 644 |
| 9 | 1080 |
| 10 | 1710 |
| 11 | 2585 |
| 12 | 3762 |
| 13 | 5304 |
| 14 | 7280 |
| 15 | 9765 |
| 16 | 12840 |
| 17 | 16592 |
| 18 | 21114 |
| 19 | 26505 |
| 20 | 32870 |
| 21 | 40320 |
| 22 | 48972 |
| 23 | 58949 |
| 24 | 70380 |
| 25 | 83400 |
| 26 | 98150 |
| 27 | 114777 |
| 28 | 133434 |
| 29 | 154280 |
| 30 | 177480 |
| 31 | 203205 |
| 32 | 231632 |
| 33 | 262944 |
| 34 | 297330 |
| 35 | 334985 |
| 36 | 376110 |
| 37 | 420912 |
| 38 | 469604 |
| 39 | 522405 |
| 40 | 579540 |
| 41 | 641240 |
| 42 | 707742 |
| 43 | 779289 |
| 44 | 856130 |