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A355057 as a simple table

na(n)
11
21
32
46
515
630
770
8210
9462
106006
1151051
12102102
13277134
146374082
1510623470
16223092870
17588153930
1818232771830
1951893273670
202127624220470
215381637734130
22252936973504110
236702829797858915
2413405659595717830
2541628100849860630
262539314151841498430
277397132529277408470

[1,1,2,6,15,30,70,210,462,6006,51051,102102,
 277134,6374082,10623470,223092870,588153930,
 18232771830,51893273670,2127624220470,
 5381637734130,252936973504110,6702829797858915,
 13405659595717830,41628100849860630,
 2539314151841498430,7397132529277408470]