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A056267 as a simple table

n a(n)
1 0
2 2
3 6
4 12
5 30
6 54
7 126
8 240
9 504
10 990
11 2046
12 4020
13 8190
14 16254
15 32730
16 65280
17 131070
18 261576
19 524286
20 1047540
21 2097018
22 4192254
23 8388606
24 16772880
25 33554400
26 67100670
27 134217216
28 268419060
29 536870910
30 1073708010
31 2147483646

[0,2,6,12,30,54,126,240,504,990,2046,4020,8190,
 16254,32730,65280,131070,261576,524286,1047540,
 2097018,4192254,8388606,16772880,33554400,
 67100670,134217216,268419060,536870910,1073708010,
 2147483646]

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Last modified August 6 22:01 EDT 2020. Contains 336256 sequences. (Running on oeis4.)