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A006691 as a simple table

na(n)
19
2148
33493
4106431
53950832
6172325014
78617033285
8485267003023
930363691715629
102088698040637242
11156612539215405732
1212709745319947141220
131109746209390479579732
14103724343230007402591558

[9,148,3493,106431,3950832,172325014,8617033285,
 485267003023,30363691715629,2088698040637242,
 156612539215405732,12709745319947141220,
 1109746209390479579732,103724343230007402591558]