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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 20 |
| 3 | 80 |
| 4 | 320 |
| 5 | 1280 |
| 6 | 5120 |
| 7 | 20480 |
| 8 | 81920 |
| 9 | 327680 |
| 10 | 1310720 |
| 11 | 5242880 |
| 12 | 20971520 |
| 13 | 83886080 |
| 14 | 335544320 |
| 15 | 1342177280 |
[1,5,20,80,320,1280,5120,20480,81920,327680, 1310720,5242880,20971520,83886080,335544320, 1342177280] |