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A147891 as a simple table

na(n)
11
22
36
416
554
6232
71132
86024
945310
10336372
112763524
1223390652
13212922998
142023344980
1520591028914
16219965702000

[1,2,6,16,54,232,1132,6024,45310,336372,2763524,
 23390652,212922998,2023344980,20591028914,
 219965702000]