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A165506 as a simple table

na(n)
01
18
248
3400
42288
520112
6108016
71018256
85030640
951991696
10229724144
112681810832
1210182741232
13139998665360
14430234843632
157409690416528
1616683460826864
17398259202498704
18536014603805680
1921766500736121744

[1,8,48,400,2288,20112,108016,1018256,5030640,
 51991696,229724144,2681810832,10182741232,
 139998665360,430234843632,7409690416528,
 16683460826864,398259202498704,536014603805680,
 21766500736121744]