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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 12 |
| 5 | 60 |
| 6 | 256 |
| 7 | 1008 |
| 8 | 4032 |
| 9 | 16320 |
| 10 | 65536 |
| 11 | 261888 |
| 12 | 1047552 |
| 13 | 4193280 |
| 14 | 16777216 |
| 15 | 67104768 |
| 16 | 268419072 |
| 17 | 1073725440 |
| 18 | 4294967296 |
| 19 | 17179803648 |
| 20 | 68719214592 |
| 21 | 274877644800 |
| 22 | 1099511627776 |
| 23 | 4398045462528 |
| 24 | 17592181850112 |
| 25 | 70368739983360 |
| 26 | 281474976710656 |
| 27 | 1125899890065408 |
| 28 | 4503599560261632 |
| 29 | 18014398442373120 |
[0,1,3,12,60,256,1008,4032,16320,65536,261888, 1047552,4193280,16777216,67104768,268419072, 1073725440,4294967296,17179803648,68719214592, 274877644800,1099511627776,4398045462528, 17592181850112,70368739983360,281474976710656, 1125899890065408,4503599560261632, 18014398442373120] |