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A222970 as a simple table

na(n)
11
22
36
412
528
654
7119
8230
9488
10948
111979
123860
137978
1415624
1532072
1663014
17128746
18253588
19516346
201019072
212069590
224091174
238291746
2416412668
2533210428
2665808044
27132985161
28263755984
29532421062
301056789662
312131312530
324233176854

[1,2,6,12,28,54,119,230,488,948,1979,3860,7978,
 15624,32072,63014,128746,253588,516346,1019072,
 2069590,4091174,8291746,16412668,33210428,
 65808044,132985161,263755984,532421062,1056789662,
 2131312530,4233176854]