n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 12 |
3 | 56 |
4 | 240 |
5 | 992 |
6 | 4032 |
7 | 16256 |
8 | 65280 |
9 | 261632 |
10 | 1047552 |
11 | 4192256 |
12 | 16773120 |
13 | 67100672 |
14 | 268419072 |
15 | 1073709056 |
16 | 4294901760 |
17 | 17179738112 |
18 | 68719214592 |
19 | 274877382656 |
20 | 1099510579200 |
21 | 4398044413952 |
22 | 17592181850112 |
23 | 70368735789056 |
24 | 281474959933440 |
[0,2,12,56,240,992,4032,16256,65280,261632, 1047552,4192256,16773120,67100672,268419072, 1073709056,4294901760,17179738112,68719214592, 274877382656,1099510579200,4398044413952, 17592181850112,70368735789056,281474959933440] |