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A207018 as a simple table

na(n)
11
22
34
410
528
6116
7576
83634
926620
10223440
112100964
1221888712
13250062982
143108430640

[1,2,4,10,28,116,576,3634,26620,223440,2100964,
 21888712,250062982,3108430640]