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A323988 as a simple table

na(n)
01
12
25
310
423
546
6102
7204
8443
9886
101898
113796
128054
1316108
1433932
1567864
16142163
17284326
18592962
191185924
202464226
214928452
2210209620
2320419240
2442190558
2584381116
26173962532
27347925064
28715908428
291431816856
302941192472
315882384944
3212065310083
3324130620166

[1,2,5,10,23,46,102,204,443,886,1898,3796,8054,
 16108,33932,67864,142163,284326,592962,1185924,
 2464226,4928452,10209620,20419240,42190558,
 84381116,173962532,347925064,715908428,1431816856,
 2941192472,5882384944,12065310083,24130620166]