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A071954 as a simple table

na(n)
02
14
210
332
4114
5420
61562
75824
821730
981092
10302634
111129440
124215122
1315731044
1458709050
15219105152
16817711554
173051741060
1811389252682
1942505269664
20158631825970
21592022034212
222209456310874
238245803209280
2430773756526242
25114849222895684

[2,4,10,32,114,420,1562,5824,21730,81092,302634,
 1129440,4215122,15731044,58709050,219105152,
 817711554,3051741060,11389252682,42505269664,
 158631825970,592022034212,2209456310874,
 8245803209280,30773756526242,114849222895684]