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| n | a(n) |
|---|---|
| 1 | 40 |
| 2 | 112 |
| 3 | 352 |
| 4 | 1216 |
| 5 | 4480 |
| 6 | 17152 |
| 7 | 67072 |
| 8 | 265216 |
| 9 | 1054720 |
| 10 | 4206592 |
| 11 | 16801792 |
| 12 | 67158016 |
| 13 | 268533760 |
| 14 | 1073938432 |
| 15 | 4295360512 |
| 16 | 17180655616 |
| 17 | 68721049600 |
| 18 | 274881052672 |
| 19 | 1099517919232 |
| 20 | 4398059094016 |
| 21 | 17592211210240 |
| 22 | 70368794509312 |
[40,112,352,1216,4480,17152,67072,265216,1054720, 4206592,16801792,67158016,268533760,1073938432, 4295360512,17180655616,68721049600,274881052672, 1099517919232,4398059094016,17592211210240, 70368794509312] |