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A166331 as a simple table
| 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 | 5242870 |
| 12 | 20971440 |
| 13 | 83885610 |
| 14 | 335541840 |
| 15 | 1342164960 |
| 16 | 5368650240 |
| 17 | 21474562560 |
| 18 | 85898096640 |
| 19 | 343591772160 |
| 20 | 1374364631040 |
| 21 | 5497448693760 |
| 22 | 21989755453530 |
| 23 | 87958864528380 |
[1,5,20,80,320,1280,5120,20480,81920,327680, 1310720,5242870,20971440,83885610,335541840, 1342164960,5368650240,21474562560,85898096640, 343591772160,1374364631040,5497448693760, 21989755453530,87958864528380] |