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A070897 as a simple table

na(n)
11
21
31
41
52
64
78
836
940
1049
11126
12121
13440
142809
1511395
1632761
17132183
18881721
193015500
2019642624
21106493895
22249987721
231257922092
244609187881
2529262161844
26189192811369
271068996265025
287388339422500
2967416357342087
30465724670229025
311979950199225010

[1,1,1,1,2,4,8,36,40,49,126,121,440,2809,11395,
 32761,132183,881721,3015500,19642624,106493895,
 249987721,1257922092,4609187881,29262161844,
 189192811369,1068996265025,7388339422500,
 67416357342087,465724670229025,1979950199225010]