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A011820 as a simple table

na(n)
02
16
232
3203
41144
55345
620926
770506
8209746
9562727
101384758
113167606
126807620
1313863904
1426941700
1550245591
1690358146
17157312324
18266040452
19438299013
20705186944
211110395771
221714352818
232599444040
243876530866

[2,6,32,203,1144,5345,20926,70506,209746,562727,
 1384758,3167606,6807620,13863904,26941700,
 50245591,90358146,157312324,266040452,438299013,
 705186944,1110395771,1714352818,2599444040,
 3876530866]