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A298178 as a simple table

na(n)
10
21
31
43
515
653
7231
81948
915321
10153043
112337091
1240632357
13844327333
1425573081565

[0,1,1,3,15,53,231,1948,15321,153043,2337091,
 40632357,844327333,25573081565]