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A334615 as a simple table

na(n)
20
30
40
52
60
710
86
972
1086
11602
12982
135426
1410558
1551246
16111602
17500076
181177210
195001518
2012462762
2151003906
22132711162
23528420604
241422458280
255547419160
2615347206464

[0,0,0,2,0,10,6,72,86,602,982,5426,10558,51246,
 111602,500076,1177210,5001518,12462762,51003906,
 132711162,528420604,1422458280,5547419160,
 15347206464]