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A051695 as a simple table

na(n)
10
20
30
40
50
690
7630
83780
918900
1094500
11457380
123825360
1331505760
14312432120
152704501800
1622984481520
17179863997040
181531709328240
1913078616488560
20147223414987200
211657733805020160
2220131890668255520
23226464779237447520
242542924546378413120
2527053572399079688000

[0,0,0,0,0,90,630,3780,18900,94500,457380,3825360,
 31505760,312432120,2704501800,22984481520,
 179863997040,1531709328240,13078616488560,
 147223414987200,1657733805020160,
 20131890668255520,226464779237447520,
 2542924546378413120,27053572399079688000]