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A188687 as a simple table

na(n)
01
12
26
325
4126
5704
64183
725897
8165166
91077520
107156352
1148222354
12328859011
132265428728
1415740837575
15110187356134
16776336572878
175501042194580
1839177463572112
19280277949384146
202013277273220064
2114514764553512488
22104993261648226446

[1,2,6,25,126,704,4183,25897,165166,1077520,
 7156352,48222354,328859011,2265428728,15740837575,
 110187356134,776336572878,5501042194580,
 39177463572112,280277949384146,2013277273220064,
 14514764553512488,104993261648226446]