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A246513 as a simple table

na(n)
10
27
352
4378
52832
621785
7171036
81364391
911023264
1089985681
11740894700
126144227430
1351267563280
14430045297695
153623966778180
1630662599042530
17260367332354496
182217928838577641
1918947382204700044
20162281586037920126

[0,7,52,378,2832,21785,171036,1364391,11023264,
 89985681,740894700,6144227430,51267563280,
 430045297695,3623966778180,30662599042530,
 260367332354496,2217928838577641,
 18947382204700044,162281586037920126]