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A328741 as a simple table

na(n)
10
20
30
40
52
69
750
8206
9862
103384
1113250
1250852
13194810
14741884
152823712
1610735998
1740843370
18155483873
19592614050
202261585918
218643288808
2233080772468
23126797503250
24486710415710
251870851589552
267201012694120
2727752927349880
28107092389688830
29413729680838330

[0,0,0,0,2,9,50,206,862,3384,13250,50852,194810,
 741884,2823712,10735998,40843370,155483873,
 592614050,2261585918,8643288808,33080772468,
 126797503250,486710415710,1870851589552,
 7201012694120,27752927349880,107092389688830,
 413729680838330]