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A153886 as a simple table

na(n)
11
218
3248
43096
536880
6428544
74910912
855827072
9631657984
107126986240
1180279745536
12903384465408
1310159659716608
14114216655527936
151283765661040640
1614427316078608384
17162125499175862272
181821782963191283712
1920470555400077574144

[1,18,248,3096,36880,428544,4910912,55827072,
 631657984,7126986240,80279745536,903384465408,
 10159659716608,114216655527936,1283765661040640,
 14427316078608384,162125499175862272,
 1821782963191283712,20470555400077574144]