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 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 13 |
| 5 | 32 |
| 6 | 72 |
| 7 | 128 |
| 8 | 360 |
| 9 | 1008 |
| 10 | 3836 |
| 11 | 9408 |
| 12 | 15512 |
| 13 | 66960 |
| 14 | 252720 |
| 15 | 785148 |
| 16 | 1137960 |
| 17 | 3340800 |
| 18 | 13072776 |
| 19 | 42465024 |
| 20 | 69530400 |
| 21 | 238761600 |
| 22 | 678562560 |
| 23 | 2412043920 |
| 24 | 5270534880 |
| 25 | 10943277120 |
| 26 | 44922182340 |
| 27 | 117229255200 |
| 28 | 209990825568 |
| 29 | 623486730240 |
| 30 | 1698651339840 |
| 31 | 7019676332760 |
| 32 | 18578092462280 |