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A026520 as a simple table

na(n)
01
11
22
34
48
520
638
7104
8196
9556
101052
113032
125774
1316778
1432146
1593872
16180772
17529684
181024256
193008864
205837908
2117184188
2233433996
2398577712
24192239854
25567591142
261109049320
273278348608
286416509142
2918986482250

[1,1,2,4,8,20,38,104,196,556,1052,3032,5774,16778,
 32146,93872,180772,529684,1024256,3008864,5837908,
 17184188,33433996,98577712,192239854,567591142,
 1109049320,3278348608,6416509142,18986482250]