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A156433 as a simple table

na(n)
31
42
50
60
742
8276
90
100
1120340
12216680
130
140
1530693320
16449345680
170
180
19105796267920
201972495637280
210
220
23696951215563680
2415784392403940160
250
260
277817495632183997760
28208339434598512497280
290
300

[1,2,0,0,42,276,0,0,20340,216680,0,0,30693320,
 449345680,0,0,105796267920,1972495637280,0,0,
 696951215563680,15784392403940160,0,0,
 7817495632183997760,208339434598512497280,0,0]