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A056267 as a simple table

na(n)
10
22
36
412
530
654
7126
8240
9504
10990
112046
124020
138190
1416254
1532730
1665280
17131070
18261576
19524286
201047540
212097018
224192254
238388606
2416772880
2533554400
2667100670
27134217216
28268419060
29536870910
301073708010
312147483646

[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]