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 | 5 |
| 2 | 0 |
| 3 | 20 |
| 4 | 20 |
| 5 | 120 |
| 6 | 100 |
| 7 | 620 |
| 8 | 600 |
| 9 | 3100 |
| 10 | 3000 |
| 11 | 15620 |
| 12 | 15480 |
| 13 | 78120 |
| 14 | 77500 |
| 15 | 390480 |
| 16 | 390000 |
| 17 | 1953120 |
| 18 | 1949900 |
| 19 | 9765620 |
| 20 | 9762480 |
| 21 | 48827480 |
| 22 | 48812500 |
| 23 | 244140620 |
| 24 | 244124400 |
| 25 | 1220703000 |
| 26 | 1220625000 |
| 27 | 6103512500 |
| 28 | 6103437480 |
| 29 | 30517578120 |
| 30 | 30517184400 |
| 31 | 152587890620 |
| 32 | 152587500000 |