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A180067 as a simple table

na(n)
10
20
30
40
50
628
781095
842752576
92436444603
1053633024900
11666519047964
125655962632720
1336502953719310
14191587564345044
15854990702601025
163346890268570368
1711756179090049177
1837692541754516628
19111774885566128630
20309788198526691600

[0,0,0,0,0,28,81095,42752576,2436444603,
 53633024900,666519047964,5655962632720,
 36502953719310,191587564345044,854990702601025,
 3346890268570368,11756179090049177,
 37692541754516628,111774885566128630,
 309788198526691600]