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A171339 as a simple table

na(n)
11
22
36
422
5118
6656
74586
836656
9332050
103326146
1136615032
12439501232
135741754786
1480586187678

[1,2,6,22,118,656,4586,36656,332050,3326146,
 36615032,439501232,5741754786,80586187678]