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A071973 as a simple table

na(n)
00
12
24
311
425
562
6162
7433
81175
93229
109042
1125549
1273050
13210356
14610041
151779830
165218745
1715372304
1845455747
19134882577
20401480918
211198344171
223585783711
2310754085805
2432319203663
2597312548674
26293515297707
27886720888966
282682778745396
298127887397064

[0,2,4,11,25,62,162,433,1175,3229,9042,25549,
 73050,210356,610041,1779830,5218745,15372304,
 45455747,134882577,401480918,1198344171,
 3585783711,10754085805,32319203663,97312548674,
 293515297707,886720888966,2682778745396,
 8127887397064]