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A066908 as a simple table

na(n)
00
10
22
33
4136
52405
66336
7460663
813148416
9347503689
103772979200
11198133379411
127608426080256
13281952316704253
144709633119830016
15316248789972027375
1616013842065532911616
17776149319714627324177

[0,0,2,3,136,2405,6336,460663,13148416,347503689,
 3772979200,198133379411,7608426080256,
 281952316704253,4709633119830016,
 316248789972027375,16013842065532911616,
 776149319714627324177]