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A222913 as a simple table

na(n)
10
26
318
4136
5654
63972
721778
8127226
9727214
104237154
1124617576
12144049162
13843945398
144961892900
1529226194746
16172530718840
171020187713214
186042341555988
1935837121558046
20212824919490178
211265353059527832

[0,6,18,136,654,3972,21778,127226,727214,4237154,
 24617576,144049162,843945398,4961892900,
 29226194746,172530718840,1020187713214,
 6042341555988,35837121558046,212824919490178,
 1265353059527832]