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A324317 as a simple table

na(n)
10
20
30
42
54
69
719
851
9107
10219
11417
12757
131470
142666
155040
169280
1717210
1832039
1959762
20111811
21210627
22397968

[0,0,0,2,4,9,19,51,107,219,417,757,1470,2666,5040,
 9280,17210,32039,59762,111811,210627,397968]