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A071801 as a simple table

na(n)
00
11
22
311
434
5152
6524
72207
87970
932744
10121252
11491988
121850380
137455944
1428337976
15113708295
16435443490
171742630120
186711230900
1926811568916
20103711749284
21413849297784
221606464657096
236405315809516
2424935144010764
2599367486347752

[0,1,2,11,34,152,524,2207,7970,32744,121252,
 491988,1850380,7455944,28337976,113708295,
 435443490,1742630120,6711230900,26811568916,
 103711749284,413849297784,1606464657096,
 6405315809516,24935144010764,99367486347752]