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A022081 as a simple table

na(n)
01
156
21512
326208
4327656
53147984
624189984
7421302976
8811401192
911197272408
1014500933104
11151844650272
12156797510688
131331217305488
141163495873088
158550203006016
166597606440936
1743532444810736
1830505974273096
19184815887035360
20119983597365744

[1,56,1512,26208,327656,3147984,24189984,
 421302976,811401192,11197272408,14500933104,
 151844650272,156797510688,1331217305488,
 1163495873088,8550203006016,6597606440936,
 43532444810736,30505974273096,184815887035360,
 119983597365744]