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A019188 as a simple table

na(n)
30
40
54
66
74
814
956
1094
11204
12638
131508
143414
159176
1623232
1757600
18148550
19388584
201001432
212614820
226905866
2318222128
2448202028
25128305452
26342215994
27913945432
282447695760
296569189860
3017654039564
3147523604660

[0,0,4,6,4,14,56,94,204,638,1508,3414,9176,23232,
 57600,148550,388584,1001432,2614820,6905866,
 18222128,48202028,128305452,342215994,913945432,
 2447695760,6569189860,17654039564,47523604660]