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A130103 as a simple table

na(n)
00
11
21
34
411
526
657
7120
8247
9502
101013
112036
124083
138178
1416369
1532752
1665519
17131054
18262125
19524268
201048555
212097130
224194281
238388584
2416777191
2533554406
2667108837
27134217700
28268435427
29536870882
301073741793
312147483616

[0,1,1,4,11,26,57,120,247,502,1013,2036,4083,8178,
 16369,32752,65519,131054,262125,524268,1048555,
 2097130,4194281,8388584,16777191,33554406,
 67108837,134217700,268435427,536870882,1073741793,
 2147483616]