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A217931 as a simple table

na(n)
10
22
32
44
58
616
732
864
9126
10252
11504
121004
132008
144016
158024
1616048
1732096
1864178
19128356
20256712
21513392
221026784
232053568
244107076
258214152
2616428304
2732856482
2865712964
29131425928
30262851612
31525703224
321051406448
332102812394
344205624788
358411249576
3616822498162

[0,2,2,4,8,16,32,64,126,252,504,1004,2008,4016,
 8024,16048,32096,64178,128356,256712,513392,
 1026784,2053568,4107076,8214152,16428304,32856482,
 65712964,131425928,262851612,525703224,1051406448,
 2102812394,4205624788,8411249576,16822498162]