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A189880 as a simple table

na(n)
11
20
30
42
510
60
78
824
972
10116
11336
121124
134056
1412628
1558984
16263066
171124116
185388972
1929219680
20173696136
21967249940

[1,0,0,2,10,0,8,24,72,116,336,1124,4056,12628,
 58984,263066,1124116,5388972,29219680,173696136,
 967249940]