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A203641 as a simple table

na(n)
11
22
35
415
552
6203
7877
84140
921147
10115975
11678570
124213596
1327644358
14190895863
151382847419
1610477213268
1782797679445
18680685836527
195806124780384
2051245294979716
21466668627500968
224371727233798927
2342000637216351225

[1,2,5,15,52,203,877,4140,21147,115975,678570,
 4213596,27644358,190895863,1382847419,10477213268,
 82797679445,680685836527,5806124780384,
 51245294979716,466668627500968,4371727233798927,
 42000637216351225]