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A006893 as a simple table

na(n)
11
22
35
420
5230
626795
7359026205
864449908476890320
92076895351339769460477611370186680
102156747150208372213435450937462082366919951682912789656986079991220

[1,2,5,20,230,26795,359026205,64449908476890320,
 2076895351339769460477611370186680,
 21567471502083722134354509374620823669199516829127\
 89656986079991220]