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A264631 as a simple table

na(n)
11
28
322
4108
5684
62736
713556
868972
9316068
101534532
117430832
1235311040
13170094764
14817176616
153914397580
1618804795120
1790252696296
18433011737840
192078662232124
209975949817428
2147876003240128
22229786823307824

[1,8,22,108,684,2736,13556,68972,316068,1534532,
 7430832,35311040,170094764,817176616,3914397580,
 18804795120,90252696296,433011737840,
 2078662232124,9975949817428,47876003240128,
 229786823307824]