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A068978 as a simple table

na(n)
11
22
39
418
5105
6210
724375
848750
9133848
1018780741
1118780965
1237561482
1337561930
14121486365
15169028685
16242972730
17338057370
18360988056
19676114740
201120584213
211285201500
221352229480
232241168426
242776831200
255352575025
265408917920
277437262140
2810705150050

[1,2,9,18,105,210,24375,48750,133848,18780741,
 18780965,37561482,37561930,121486365,169028685,
 242972730,338057370,360988056,676114740,
 1120584213,1285201500,1352229480,2241168426,
 2776831200,5352575025,5408917920,7437262140,
 10705150050]