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A001626 as a simple table

na(n)
10
20
32
436
5840
629680
71429920
890318144
97237943552
10717442928640
1186171602072320
1212331048749268480
132072725870491859968
14404352831489304049664
1590605920564322676531200
1623110943021722435879157760
176657484407493222296916131840

[0,0,2,36,840,29680,1429920,90318144,7237943552,
 717442928640,86171602072320,12331048749268480,
 2072725870491859968,404352831489304049664,
 90605920564322676531200,
 23110943021722435879157760,
 6657484407493222296916131840]