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A169766 as a simple table

na(n)
40
50
60
70
80
90
104
110
120
130
148
150
1648
170
18152
190
20352
210
221200
230
243752
250
2612912
270
2834768
290
30122120
310
32346128
330
341202240
350
363337424
370
3811650864
390
4032634960
410
42113539392
430
44316870592
450
461104442752
470
483086894528
490
5010748713792
510
5230023935744
530

[0,0,0,0,0,0,4,0,0,0,8,0,48,0,152,0,352,0,1200,0,
 3752,0,12912,0,34768,0,122120,0,346128,0,1202240,
 0,3337424,0,11650864,0,32634960,0,113539392,0,
 316870592,0,1104442752,0,3086894528,0,10748713792,
 0,30023935744,0]