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A188911 as a simple table

na(n)
01
16
248
3438
44356
546056
6509106
75814738
868050116
9811240872
109810384048
11119990105208
121481115683754
1318421300391760
14230574816629310
152901721280735838
1636688485233689668
17465774244616805624
185934465567864915024

[1,6,48,438,4356,46056,509106,5814738,68050116,
 811240872,9810384048,119990105208,1481115683754,
 18421300391760,230574816629310,2901721280735838,
 36688485233689668,465774244616805624,
 5934465567864915024]