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A188691 as a simple table

na(n)
121
2441
33609
420662
5139307
61181340
79908740
875877068
9567455273
104366586742
1134248998327
12267095931282
132063862354490
1415938318691269
15123521439902876
16958572046267137
177431458286122944
1857564941872885645
19445967087965474764

[21,441,3609,20662,139307,1181340,9908740,
 75877068,567455273,4366586742,34248998327,
 267095931282,2063862354490,15938318691269,
 123521439902876,958572046267137,7431458286122944,
 57564941872885645,445967087965474764]