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A011958 as a simple table

na(n)
11
21
33
48
522
668
7216
8728
92513
108920
1132116
12117240
13431550
141600734
155970704
1622381184
1784236890
18318191804
191205692236
204581481776
2117452915218
2266637798834
23254960616136
24977346581800
253753005281872

[1,1,3,8,22,68,216,728,2513,8920,32116,117240,
 431550,1600734,5970704,22381184,84236890,
 318191804,1205692236,4581481776,17452915218,
 66637798834,254960616136,977346581800,
 3753005281872]