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A268160 as a simple table

na(n)
10
20
38
414
552
61516
77582
846338
9501270
103535396
1125480614
12220369120
131716544860
1413279246254
15108919001860
16873463942418
176971258302462
1856716000746978
19460015101808320
203726764125840338
2130399952923410062

[0,0,8,14,52,1516,7582,46338,501270,3535396,
 25480614,220369120,1716544860,13279246254,
 108919001860,873463942418,6971258302462,
 56716000746978,460015101808320,3726764125840338,
 30399952923410062]