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A188780 as a simple table

na(n)
10
20
38
4584
55464
626360
791120
8252720
9603696
101288592
112525400
124620728
137998984
1413219528
1521014336
1632306400
1748256608
1870282656
19100115880
20139819944
21191858360
22259112216
23344959120
24453289232
25588596368
26755991600

[0,0,8,584,5464,26360,91120,252720,603696,1288592,
 2525400,4620728,7998984,13219528,21014336,
 32306400,48256608,70282656,100115880,139819944,
 191858360,259112216,344959120,453289232,588596368,
 755991600]