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A147003 as a simple table

na(n)
11
21
31
41
57
621
777
8479
93600
1033995
11482862
128547925
13199841936
146379998757
15265761442757
1614715360146745

[1,1,1,1,7,21,77,479,3600,33995,482862,8547925,
 199841936,6379998757,265761442757,14715360146745]