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A066178 as a simple table

na(n)
01
11
22
34
48
516
632
764
8127
9253
10504
111004
122000
133984
147936
1515808
1631489
1762725
18124946
19248888
20495776
21987568
221967200
233918592
247805695
2515548665
2630972384
2761695880
28122895984
29244804400
30487641600

[1,1,2,4,8,16,32,64,127,253,504,1004,2000,3984,
 7936,15808,31489,62725,124946,248888,495776,
 987568,1967200,3918592,7805695,15548665,30972384,
 61695880,122895984,244804400,487641600]