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A001665 as a simple table

na(n)
01
14
212
332
488
5240
6652
71744
84616
912208
1032328
1185408
12224640
13589024
141542944
154039256
1610560552
1727567488
1871878068
19187262944
20487526944
211268269160
223296832292
238564411120
2422235825104
2557701041072
26149657337872
27387978891176
281005378745536
292604222063144
306743181213712
3117454178002264

[1,4,12,32,88,240,652,1744,4616,12208,32328,85408,
 224640,589024,1542944,4039256,10560552,27567488,
 71878068,187262944,487526944,1268269160,
 3296832292,8564411120,22235825104,57701041072,
 149657337872,387978891176,1005378745536,
 2604222063144,6743181213712,17454178002264]