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A026018 as a simple table

na(n)
31
47
536
6164
7702
82898
911696
1046512
11183141
12716243
132788060
1410817820
1541880930
16161900910
17625272480
182413491360
199313307370
2035936613414
21138680365704
22535290282632
232066802226236
247983111461732
2530848211650592

[1,7,36,164,702,2898,11696,46512,183141,716243,
 2788060,10817820,41880930,161900910,625272480,
 2413491360,9313307370,35936613414,138680365704,
 535290282632,2066802226236,7983111461732,
 30848211650592]