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A145844 as a simple table

na(n)
01
12
28
346
4332
52784
625888
7259382
82749244
930449416
10349379648
114127103776
1249954287424
13617299996928
147765434294912
1599214734136966
161285011754097372
1716845342401817048
18223216584359771296
192986529546579794040
2040308007404730514096
21548337251596355725312

[1,2,8,46,332,2784,25888,259382,2749244,30449416,
 349379648,4127103776,49954287424,617299996928,
 7765434294912,99214734136966,1285011754097372,
 16845342401817048,223216584359771296,
 2986529546579794040,40308007404730514096,
 548337251596355725312]