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A297864 as a simple table

na(n)
10
225
3222
41052
521519
6284344
73740362
852727368
9711614693
109830071754
11134957151331
121851435077345
1325452957854923
14349571109226366
154802011704262362
1665968126409569608
17906203504992390038

[0,25,222,1052,21519,284344,3740362,52727368,
 711614693,9830071754,134957151331,1851435077345,
 25452957854923,349571109226366,4802011704262362,
 65968126409569608,906203504992390038]