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A147898 as a simple table

na(n)
11
22
36
424
596
6444
72508
813216
981030
10566512
114383340
1243168552
13356745786
143125719866
1530567653042
16349720370632

[1,2,6,24,96,444,2508,13216,81030,566512,4383340,
 43168552,356745786,3125719866,30567653042,
 349720370632]