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A045891 as a simple table

na(n)
01
11
23
37
416
536
680
7176
8384
9832
101792
113840
128192
1317408
1436864
1577824
16163840
17344064
18720896
191507328
203145728
216553600
2213631488
2328311552
2458720256
25121634816
26251658240
27520093696
281073741824
292214592512
304563402752

[1,1,3,7,16,36,80,176,384,832,1792,3840,8192,
 17408,36864,77824,163840,344064,720896,1507328,
 3145728,6553600,13631488,28311552,58720256,
 121634816,251658240,520093696,1073741824,
 2214592512,4563402752]