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A068134 as a simple table

na(n)
00
11
22
33
47
512
656
7109
8368
91332
105656
1128248
12140547
13774325
148485151
1534339452
16397492132
173996973827
1863229707890
191039037824132

[0,1,2,3,7,12,56,109,368,1332,5656,28248,140547,
 774325,8485151,34339452,397492132,3996973827,
 63229707890,1039037824132]