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A374951 as a simple table

na(n)
10
20
31
49
539
6120
7300
8645
91261
102262
113825
126160
139471
1414178
1520376
1628965
1739600
1854066
1971145
2094248
21120140
22155310
23193116
24244560
25297819
26370860
27443710
28544554
29641655
30778458
31904800
321085445
331248762
341483308
351688052
361991515
372244375
382626380

[0,0,1,9,39,120,300,645,1261,2262,3825,6160,9471,
 14178,20376,28965,39600,54066,71145,94248,120140,
 155310,193116,244560,297819,370860,443710,544554,
 641655,778458,904800,1085445,1248762,1483308,
 1688052,1991515,2244375,2626380]