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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 64 |
| 3 | 144 |
| 4 | 376 |
| 5 | 856 |
| 6 | 1984 |
| 7 | 4480 |
| 8 | 9856 |
| 9 | 22144 |
| 10 | 47104 |
| 11 | 105472 |
| 12 | 219136 |
| 13 | 489472 |
| 14 | 999424 |
| 15 | 2228224 |
| 16 | 4489216 |
| 17 | 9994240 |
| 18 | 19922944 |
| 19 | 44302336 |
| 20 | 87556096 |
| 21 | 194510848 |
| 22 | 381681664 |
| 23 | 847249408 |
| 24 | 1652555776 |
| 25 | 3665821696 |
[16,64,144,376,856,1984,4480,9856,22144,47104, 105472,219136,489472,999424,2228224,4489216, 9994240,19922944,44302336,87556096,194510848, 381681664,847249408,1652555776,3665821696] |