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A228568 as a simple table

na(n)
02
18
248
3320
42176
514848
6101376
7692224
84726784
932276480
10220397568
111504968704
1210276569088
1370172803072
14479169871872
153271976550400
1622342453428224
17152563815022592
181041770892754944
197113656621858816
2048575085832830976
21331691433687777280

[2,8,48,320,2176,14848,101376,692224,4726784,
 32276480,220397568,1504968704,10276569088,
 70172803072,479169871872,3271976550400,
 22342453428224,152563815022592,1041770892754944,
 7113656621858816,48575085832830976,
 331691433687777280]