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A365468 as a simple table

na(n)
10
20
30
40
51
6251
735176
84105312
9466029138
1054944041476
116886218018445
12920364154307990
13130498580283240363
1419482086451147555715
153039784702880850466554
16492560752706827973431360
1782451674043232981553367317
1814196926753609833253834234271

[0,0,0,0,1,251,35176,4105312,466029138,
 54944041476,6886218018445,920364154307990,
 130498580283240363,19482086451147555715,
 3039784702880850466554,492560752706827973431360,
 82451674043232981553367317,
 14196926753609833253834234271]