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A107660 as a simple table

na(n)
01
16
221
372
4225
5702
62133
76480
819521
958806
10176661
11530712
121592865
134780782
1414344533
1543040160
16129127041
17387400806
181162222101
193486725352
2010460235105
2131380882462
2294142824533
23282429005040
24847287546561

[1,6,21,72,225,702,2133,6480,19521,58806,176661,
 530712,1592865,4780782,14344533,43040160,
 129127041,387400806,1162222101,3486725352,
 10460235105,31380882462,94142824533,282429005040,
 847287546561]