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 | 36 |
| 1 | 96 |
| 2 | 450 |
| 3 | 1368 |
| 4 | 5292 |
| 5 | 20352 |
| 6 | 79650 |
| 7 | 324000 |
| 8 | 1285020 |
| 9 | 5346720 |
| 10 | 21788832 |
| 11 | 91199976 |
| 12 | 378084780 |
| 13 | 1590491136 |
| 14 | 6669799788 |
| 15 | 28184656536 |
| 16 | 119093015550 |
| 17 | 505409136480 |
| 18 | 2147032241928 |
| 19 | 9145594625376 |
| 20 | 39007441263438 |