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A147940 as a simple table

na(n)
11
22
36
416
554
6232
7936
85070
925700
10144538
11829398
124949114
1330028194
14195791072
151612860652
1613023036794

[1,2,6,16,54,232,936,5070,25700,144538,829398,
 4949114,30028194,195791072,1612860652,13023036794]