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A001553 as a simple table

na(n)
06
121
291
3441
42275
512201
667171
7376761
82142595
912313161
1071340451
11415998681
122438235715
1314350108521
1484740914531
15501790686201
162978035877635
1717706908038281
18105443761093411
19628709267031321
203752628871164355
2122418196307542441
22134023513204581091

[6,21,91,441,2275,12201,67171,376761,2142595,
 12313161,71340451,415998681,2438235715,
 14350108521,84740914531,501790686201,
 2978035877635,17706908038281,105443761093411,
 628709267031321,3752628871164355,
 22418196307542441,134023513204581091]